18 Crochet Cool Blue and Buttercream Winter Oversized Cocoon Cardigan Ideas
Cool Blue and Buttercream create a useful winter palette for an oversized crochet cocoon cardigan because the two shades can separate the broad body from the smaller structural areas that define its shape. Cool Blue can cover the expansive back and side panels, while Buttercream can lighten cuffs, armholes, shawl-style edging, and the long front opening.
The generous cocoon silhouette makes color balance especially important. A narrow Buttercream border can travel around a very large opening and therefore contribute more pale color than expected. Likewise, Cool Blue sleeves or cuffs can become major focal areas when the cardigan body is mostly Buttercream.
Texture adds another consideration. Puff stitches, granny clusters, ribbing, lace, and corner-to-corner fabric each distribute color differently. Instead of forcing both shades into every stitch pattern, use contrast where it clarifies the cardigan’s oversized proportions, folding, armholes, cuffs, or front frame.
The tutorials below include exact cocoon cardigans and cocoon shrugs alongside related oversized and rectangle-based cardigan constructions. Follow each creator for the construction actually demonstrated; Cool Blue and Buttercream are independent editorial color adaptations unless specifically verified otherwise.
Quick List
- Cool Blue Body and Buttercream Shawl-Edge Crochet Cocoon Cardigan
- Buttercream Lace Body and Cool Blue Armhole Crochet Cocoon Cardigan
- Cool Blue Puff-Texture and Buttercream Ribbed Crochet Cocoon Cardigan
- Buttercream C2C Body and Cool Blue Border Crochet Cocoon Cardigan
- Cool Blue Cosmic Body and Buttercream Cuff Crochet Cocoon Cardigan
- Buttercream Granny-Stripe and Cool Blue Ribbing Crochet Cocoon Cardigan
- Cool Blue Textured Rectangle and Buttercream Edge Crochet Cocoon Cardigan
- Buttercream Pocket Body and Cool Blue Trim Crochet Oversized Cardigan
- Cool Blue Super-Oversized Body and Buttercream Front-Band Crochet Cardigan
- Buttercream Granny-Stitch and Cool Blue Cuff Crochet Cocoon Cardigan
- Cool Blue Granny Shrug and Buttercream Frame Crochet Cocoon Cardigan
- Buttercream Ribbed Shrug and Cool Blue Sleeve Crochet Oversized Cardigan
- Cool Blue Soft Rectangle and Buttercream Plush-Edge Crochet Cocoon Cardigan
- Buttercream Cocoon Body and Cool Blue Placket Crochet Cardigan
- Cool Blue Square-Motif and Buttercream Join Crochet Cocoon Cardigan
- Buttercream Cozy Body and Cool Blue Wide-Edge Crochet Cocoon Cardigan
- Cool Blue Hygge Body and Buttercream Cuff Crochet Cocoon Cardigan
- Buttercream Winter Body and Cool Blue Shawl-Collar Crochet Cocoon Cardigan
Decide Whether Cool Blue or Buttercream Should Cover the Oversized Body
The body is the largest color zone on a cocoon cardigan, so its shade usually determines the overall impression. Cool Blue creates a cooler winter foundation and gives Buttercream finishing immediate visibility. Buttercream creates a lighter, softer-looking cocoon and allows relatively narrow Cool Blue borders to provide considerable definition.
Make this decision before planning the cuffs. The central rectangle or oversized panel may represent most of the garment, but a contrast color repeated around two armholes, two cuffs, and the full front opening can quickly become a major secondary color.
Use Cool Blue and Buttercream to Clarify the Cocoon Opening
A cocoon cardigan often has one large front-and-neck opening rather than two conventional front panels. Following this opening with the supporting shade can make the folded construction easier to read.
Buttercream edging around a Cool Blue body creates a light frame, while Cool Blue around a Buttercream cocoon produces a more structured outline. If this border is already wide or ribbed, keep other contrast areas narrower so the entire cardigan does not become equally outlined.
Check Cool Blue and Buttercream Across Winter Texture
Dense ribbing or puff texture can make a color appear visually heavier than the same amount worked in lace or granny clusters. A Buttercream ribbed frame may therefore look more substantial than a larger Buttercream openwork section.
Work a small sample in the actual body and finishing textures before committing to the color split. If Cool Blue and Buttercream are relatively close in light-dark value, a grayscale photograph can help show whether narrow cuffs or borders remain distinct.
1. Cool Blue Body and Buttercream Shawl-Edge Crochet Cocoon Cardigan

Let Cool Blue cover the main oversized rectangle and use Buttercream around the continuous front opening. This keeps the broad garment strongly blue while allowing one pale route to frame the neckline, front, and lower opening without introducing stripes through the body.
Cool Blue Should Keep the Oversized Crochet Cocoon Body Continuous
Use Cool Blue across most of the back and side surface when you want the cardigan’s relaxed drape to remain the primary visual feature. Breaking the body into repeated Buttercream bands can shorten the apparent expanse of the cocoon.
Allow stitch texture and folds to provide variation inside the large Cool Blue field.
Buttercream Can Give the Cool Blue Cocoon Opening a Soft Frame
Run Buttercream around the opening where the cardigan naturally folds toward the front. Because that edge travels around a large portion of the garment, even moderate-width finishing can provide substantial pale contrast.
Keep the armhole treatment Cool Blue or much narrower in Buttercream if you want the front frame to remain the main accent.
Creator Credit: Olga Poltava
2. Buttercream Lace Body and Cool Blue Armhole Crochet Cocoon Cardigan

Use Buttercream across an open lace cocoon and concentrate Cool Blue around the armholes. The pale openwork keeps the oversized body visually light, while the cooler blue marks the points where the large rectangle becomes a wearable cardigan.
Buttercream Should Keep the Crochet Lace Cocoon Visually Open
Use Buttercream continuously through the main lace pattern so the negative spaces and repeated stitches remain easy to follow. Frequent Cool Blue changes inside the lace could turn the body into a striped field instead of emphasizing its airy construction.
The clothing underneath will also show through, so judge the Buttercream lace over realistic winter layers.
Cool Blue Can Define the Buttercream Cocoon Armholes
Place Cool Blue around both arm openings in similar widths so the cardigan has balanced side definition. The darker or cooler contrast can clarify where the loose body transitions into the sleeve area.
If the armhole bands are substantial, keep the large front border Buttercream for a quieter result.
Creator Credit: Let’s All Crochet
3. Cool Blue Puff-Texture and Buttercream Ribbed Crochet Cocoon Cardigan

A puff-textured cocoon already has considerable surface variation, so let Cool Blue handle the body and reserve Buttercream for denser ribbed finishing. The change in both texture and color makes the borders clear without forcing another pattern into the central rectangle.
Cool Blue Lets Puff Texture Carry the Cocoon Cardigan Body
Keep Cool Blue consistent through the raised stitch field so shadow provides the internal variation. Switching between blue and cream inside every puff repeat could make the oversized surface unnecessarily busy.
View the fabric from normal wearing distance before deciding it needs additional color accents.
Buttercream Ribbing Can Separate the Cool Blue Body From the Edges
Use Buttercream at the cuffs or opening where denser ribbing naturally marks a structural change. Because ribbing concentrates more yarn visually, the pale shade may look more substantial there than it would in the puff body.
Choose one broad Buttercream ribbed area and keep secondary repeats narrower.
Creator Credit: HanJan Crochet
4. Buttercream C2C Body and Cool Blue Border Crochet Cocoon Cardigan

Use Buttercream through a corner-to-corner cocoon body and add Cool Blue at the finished perimeter. The diagonal texture already gives the body strong direction, so a single contrasting frame is more useful than alternating the colors across every diagonal row.
Buttercream Should Let the C2C Crochet Cocoon Texture Stay Visible
Keep the large central section Buttercream when you want the diagonal construction to provide most of the surface detail. A consistent pale field also gives the cocoon’s folds more visual continuity.
If you want Cool Blue inside the body, restrict it to a controlled corner or outer section rather than frequent narrow stripes.
Cool Blue Can Give the Buttercream C2C Cocoon a Defined Perimeter
Use Cool Blue where the completed square or rectangle becomes the cardigan opening or armhole finish. The border provides a clear endpoint for the pale diagonal field.
Check the complete opening before widening the blue edge; its long path can make Cool Blue more dominant than expected.
Creator Credit: Bag-O-Day Crochet
5. Cool Blue Cosmic Body and Buttercream Cuff Crochet Cocoon Cardigan

Let Cool Blue cover a highly textured cocoon body and use Buttercream specifically at the cuffs and selected neckline finishing. This gives the pale shade two clear endpoints at the wrists without breaking up the more decorative central fabric.
Cool Blue Should Keep the Textured Crochet Cocoon Unified
Use Cool Blue consistently through the main patterned rectangle so its repeated texture remains the visual focus. The oversized body already contains enough movement without additional broad Buttercream blocks.
Keep the upper and lower body in the same blue if you want the cocoon shape to remain expansive.
Buttercream Cuffs Can Lighten Long Cool Blue Sleeves
Use Buttercream at the wrists where the cardigan already changes into finishing. Two matching cuffs create a repeated pale detail without surrounding the entire garment.
A narrow Buttercream neckline repeat can connect the cuffs to the body if needed, but the wrists can remain the primary accent.
Creator Credit: Craft and a Cuppa®
6. Buttercream Granny-Stripe and Cool Blue Ribbing Crochet Cocoon Cardigan

A granny-stripe cocoon can stay largely Buttercream while Cool Blue is moved into the ribbing. This keeps the open cluster field light and lets the blue define the wrist and front opening through denser crochet.
Buttercream Should Keep the Granny-Stripe Cocoon From Looking Too Segmented
Use Buttercream across broad runs of granny clusters rather than alternating every row with Cool Blue. The stitch spaces already create horizontal rhythm, and repeated color striping can make the cardigan visually shorter.
A pale field also works well with the generous volume of a cocoon shape.
Cool Blue Ribbing Can Structure the Buttercream Granny Cardigan
Use Cool Blue around the wrists and main opening to create a coordinated finishing system. The denser blue sections contrast with both the color and openness of the Buttercream granny field.
If the opening ribbing is wide, keep the cuffs modest so the blue frame does not overpower the body.
Creator Credit: Unique stitch designs
7. Cool Blue Textured Rectangle and Buttercream Edge Crochet Cocoon Cardigan

For a simple rectangle-based cocoon, use Cool Blue through the complete main fabric and move Buttercream only to the final edges. The result is easy to read visually because body and finishing have completely separate color jobs.
Cool Blue Should Keep the Rectangle Cocoon Broad and Uninterrupted
Use Cool Blue from side to side through the main rectangle if you want the loose folded shape to remain the strongest feature.
This arrangement is particularly useful when the body texture already contains raised or patterned stitches that do not need additional color blocking.
Buttercream Can Finish the Cool Blue Cocoon Without Dividing the Body
Add Buttercream around the opening and possibly the armholes after the Cool Blue body is complete. This gives the pale color a natural structural reason to appear.
Avoid adding a Buttercream stripe through the middle solely to balance the palette; the long outer edge may already provide enough cream.
Creator Credit: Fiber Flux
8. Buttercream Pocket Body and Cool Blue Trim Crochet Oversized Cardigan

Use Buttercream across an oversized cardigan body and keep the pocket faces in the same pale shade. Cool Blue can then define pocket openings, cuffs, or the lower edge without turning the pockets into large contrasting blocks.
Buttercream Pockets Should Blend Into the Cool Blue-Trimmed Cardigan
Matching Buttercream pockets to the body keeps the broad front surface calm and lets the oversized proportions remain visually continuous.
If you want the pockets more visible, use Cool Blue only at their openings rather than recoloring the complete pocket.
Cool Blue Can Connect Buttercream Pocket Edges to the Cardigan Finish
Repeat Cool Blue at two or three structural points, such as pocket openings, cuffs, and a narrow front band. That creates a finishing system rather than isolated blue accents.
Keep the widest blue treatment at one location so every edge does not compete equally.
Creator Credit: Rachell Young
9. Cool Blue Super-Oversized Body and Buttercream Front-Band Crochet Cardigan

A super-oversized cardigan gives Cool Blue enormous surface area, making a Buttercream front band useful for breaking up the central opening without segmenting the back or sleeves.
Cool Blue Should Carry the Super-Oversized Crochet Cardigan Volume
Keep the largest body and sleeve sections Cool Blue so the generous silhouette remains cohesive. Multiple wide Buttercream blocks across that volume can make the garment look more patchworked than cocoon-like.
Use the Cool Blue field to let drape and proportion provide most of the visual interest.
Buttercream Front Bands Can Lengthen a Cool Blue Oversized Cardigan
Run Buttercream vertically along the front opening where it can emphasize length rather than width. This helps the pale contrast work with the oversized proportions instead of cutting across them.
If the front bands are long, keep the hem Cool Blue so Buttercream does not surround the complete body.
Creator Credit: WONDER NETTING
10. Buttercream Granny-Stitch and Cool Blue Cuff Crochet Cocoon Cardigan

Let Buttercream dominate a granny-stitch cocoon shrug and reserve Cool Blue for sleeve cuffs or the armhole finishing. This creates a pale winter body with small cooler anchors at each side.
Buttercream Should Keep Granny-Stitch Cocoon Panels Consistent
Use Buttercream across the repeating clusters when you want the loose granny surface to remain calm. The openings already provide a strong texture pattern, so frequent Cool Blue changes are unnecessary.
This also leaves plenty of visible pale area when the cardigan is folded into its cocoon shape.
Cool Blue Cuffs Can Define Buttercream Granny-Stitch Sleeves
Use Cool Blue around the wrists or finished arm openings to create a clear endpoint for the open Buttercream body.
Repeat blue at both sides in comparable widths. An additional narrow neckline detail can connect them if the cuffs appear isolated.
Creator Credit: Stitched_goddess
11. Cool Blue Granny Shrug and Buttercream Frame Crochet Cocoon Cardigan

Use Cool Blue through the granny-stitch body while Buttercream frames the finished opening. This keeps the motif field darker and more defined while giving the large cocoon perimeter a light winter finish.
Cool Blue Should Stay Continuous Through the Granny Cocoon Body
Keep most cluster rows Cool Blue so the open pattern remains cohesive after the rectangle is folded and seamed.
A single-color granny field also makes it easier to see whether Buttercream framing is wide enough without adding competing internal stripes.
Buttercream Can Frame the Cool Blue Granny Cocoon From Neck to Hem
Use Buttercream around the full central opening where the border remains visible from several angles.
Because the frame can be extensive, leave the armholes mostly Cool Blue or use only a narrow cream repeat to preserve the darker body.
Creator Credit: Ascarcrochets
12. Buttercream Ribbed Shrug and Cool Blue Sleeve Crochet Oversized Cardigan

A shorter oversized shrug construction can support a winter cocoon adaptation by using Buttercream through the central body and Cool Blue across the sleeve or cuff sections. The color change places more emphasis on the arms than the torso.
Buttercream Should Keep the Crochet Shrug Center Light
Use Buttercream across the back and central body so the short cocoon-like volume remains easy to read. Large Cool Blue blocks through the center can visually divide an already compact garment.
This pale center also gives darker sleeve details enough contrast to feel deliberate.
Cool Blue Sleeves Can Ground a Buttercream Oversized Shrug
Use Cool Blue from the arm transition toward the cuff if you want the sides to carry more visual weight.
Repeat a small amount of blue at the neckline or lower edge if the sleeves otherwise feel detached, but keep Buttercream dominant across the center.
Creator Credit: TCDDIY
13. Cool Blue Soft Rectangle and Buttercream Plush-Edge Crochet Cocoon Cardigan

Use Cool Blue across a soft rectangle-based shrug and concentrate Buttercream around the visibly fuller or softer-looking edging. The two-color plan lets the border function like a pale winter lining without dividing the main body.
Cool Blue Should Give the Soft Crochet Cocoon One Continuous Field
Keep the rectangle Cool Blue if the yarn or stitch texture already creates visual softness. Repeated color blocks can distract from the draped cocoon construction.
Judge the blue body after folding it into the finished shape because the layered areas may appear deeper than the flat fabric.
Buttercream Can Make the Cool Blue Edge Look More Winter-Ready
Use Buttercream where the cardigan frames the neckline or opening. If the edging texture is visually full, even a narrow cream section can appear substantial.
Keep the Buttercream confined to one connected route rather than repeating it randomly across the Cool Blue body.
Creator Credit: A. LeLong
14. Buttercream Cocoon Body and Cool Blue Placket Crochet Cardigan

Let Buttercream cover the cocoon panels while Cool Blue defines the placket or front ribbing. This produces a lighter winter cardigan whose strongest color follows the opening rather than the back or sleeves.
Buttercream Should Keep the Cocoon Panels Visually Connected
Use Buttercream across the major pieces so the body remains pale and expansive. The simple field also gives the front finishing enough contrast to show clearly.
If the cardigan has separate wrist ribbing, decide whether Cool Blue should repeat there before making the front band especially wide.
Cool Blue Can Give the Buttercream Placket a Strong Vertical Line
Use Cool Blue along the front where the finishing already creates structure. A vertical blue route can make the Buttercream body appear more defined without adding dark horizontal blocks.
If the placket is substantial, keep the hem Buttercream so the blue remains concentrated at the opening.
Creator Credit: Orinam crochet
15. Cool Blue Square-Motif and Buttercream Join Crochet Cocoon Cardigan

A cocoon constructed from square motifs gives the palette more internal divisions than a single rectangle. Use Cool Blue through most motif areas and Buttercream where the pieces meet or transition into ribbing.
Cool Blue Motifs Need Enough Space Around Buttercream Joins
Keep the Cool Blue square surfaces broad enough that the lighter joining network does not become the dominant feature. On an oversized cocoon, repeated seams can add up across a surprisingly large area.
Arrange the motifs in garment order before joining to check where the Buttercream lines will land.
Buttercream Joins Can Organize Cool Blue Square-Motif Panels
Use Buttercream consistently where the Cool Blue pieces meet so the pale shade becomes part of the construction logic.
If the join already creates a strong grid, keep cuffs or opening ribbing Cool Blue or use only a narrow Buttercream repeat.
Creator Credit: Bella Coco
16. Buttercream Cozy Body and Cool Blue Wide-Edge Crochet Cocoon Cardigan

Use Buttercream across the large cocoon body and give Cool Blue to a deeper opening or wide finishing edge. This is one of the stronger high-contrast options because the blue becomes a substantial frame around the pale garment.
Buttercream Should Remain Broad Inside the Cool Blue Cocoon Frame
Leave enough uninterrupted Buttercream through the back and folded sides for the garment to remain visibly cream-dominant.
A very wide Cool Blue edge can quickly change the balance, so assess the finished opening before repeating blue extensively on the sleeves.
Cool Blue Wide Edging Can Give Buttercream More Structure
Use the darker or cooler shade around the opening when you want the cardigan’s folded cocoon shape to be immediately visible.
If the edge is broad, keep the cuffs Buttercream or use only one narrow blue line so the front frame remains the main structural accent.
Creator Credit: Hey Carrie
17. Cool Blue Hygge Body and Buttercream Cuff Crochet Cocoon Cardigan

A cozy cocoon with substantial texture and finishing can use Cool Blue across the body while Buttercream marks the cuffs and selected collar sections. This produces a winter palette with a strong blue center and soft pale endpoints.
Cool Blue Should Keep the Hygge Crochet Cocoon Visually Grounded
Use Cool Blue through the large central fabric so the texture and relaxed silhouette work together instead of competing with multiple color blocks.
If the body already has significant raised texture, let Buttercream stay out of the main stitch field.
Buttercream Cuffs Can Lighten the Cool Blue Cocoon at the Wrists
Use Buttercream around both cuffs where the cardigan naturally narrows. The pale color draws attention to the transition from oversized body to fitted finishing.
A modest Buttercream collar repeat can connect the wrists to the center without turning every outer edge pale.
Creator Credit: Tamara Kelly – Moogly
18. Buttercream Winter Body and Cool Blue Shawl-Collar Crochet Cocoon Cardigan

Finish with a Buttercream-dominant cocoon and give Cool Blue to the shawl-style collar or wide front frame. The pale body remains soft and expansive, while the blue neckline creates one strong winter focal area that stays visible even when the cardigan overlaps or drapes.
Buttercream Should Keep the Oversized Cocoon Body Quiet Beside Cool Blue
Use Buttercream throughout the back and broad side areas so the Cool Blue collar has enough surrounding space to remain distinct.
Avoid adding several equally wide blue body stripes; the shawl treatment already supplies a major contrast zone.
Cool Blue Can Give the Buttercream Shawl Collar More Visual Weight
Use Cool Blue continuously through the wide collar when you want the neckline and front opening to become the main structural feature.
Repeat the blue narrowly at the cuffs only if the collar needs a second connection elsewhere. Keeping the repeat smaller preserves the collar’s hierarchy.
Creator Credit: Marly Bird
Comparing the Cool Blue and Buttercream Cocoon Cardigan Directions
For a Cool Blue-dominant cocoon, ideas 1, 3, 5, 7, 9, 11, 13, 15, and 17 give blue most of the body, granny field, texture, or oversized volume. Buttercream then works as the lighter finishing shade through shawl edges, cuffs, joins, plush-looking borders, or opening frames.
Ideas 2, 4, 6, 8, 10, 12, 14, 16, and 18 give Buttercream more surface area. Cool Blue becomes the structural shade around armholes, ribbing, pockets, sleeves, plackets, wide edges, or the shawl collar.
For the clearest cocoon silhouette, ideas 1, 4, 7, 14, 16, and 18 put contrast around the garment opening. Ideas 5, 10, and 17 emphasize the cuffs, while ideas 6, 11, and 15 use granny or motif-based construction to distribute the palette more visibly throughout the body.
Conclusion
Cool Blue and Buttercream work especially well for an oversized winter cocoon cardigan because the palette can clarify a garment that is intentionally broad, draped, and minimally shaped. Cool Blue gives the body a cooler visual anchor, while Buttercream can make cuffs, borders, armholes, and shawl-style finishing easier to distinguish.
For the quietest color direction, keep one shade across the complete body and use the other only around the opening or wrists. For a stronger two-color result, divide the body and finishing colors clearly or use granny motifs and contrasting joins rather than adding unrelated stripes.
The tutorials in this list do not all use identical cocoon construction. Several are exact cocoon cardigans, while a few demonstrate closely related oversized or rectangle-based shrug/cardigan structures that can inform specific finishing ideas. Follow each creator for the construction actually shown and treat the Cool Blue and Buttercream placement as your independent winter adaptation.
Frequently Asked Questions
Should Cool Blue or Buttercream dominate a winter cocoon cardigan?
Either can lead. Cool Blue creates a cooler, more defined oversized body and makes Buttercream finishing immediately visible. Buttercream creates a lighter cardigan and allows Cool Blue borders, cuffs, or a shawl collar to provide stronger structure.
Where should Buttercream go on a mostly Cool Blue cocoon cardigan?
The front opening, shawl edge, cuffs, armholes, motif joins, or pocket openings are useful locations. Choose one major finishing area and one smaller repeat instead of outlining every edge equally.
Is Cool Blue a good border color for a Buttercream cocoon cardigan?
Yes. A Cool Blue border can make the large opening, armholes, or lower edge easier to see against a pale body. If the border is wide, keep other blue details narrower so the garment does not become more blue than intended.
How can I keep Cool Blue and Buttercream from making an oversized cardigan look striped?
Assign the shades to structural zones instead of alternating frequent rows. A Buttercream body with Cool Blue cuffs, or a Cool Blue body with a Buttercream opening, usually preserves the cocoon silhouette better than many horizontal bands.
Should the cuffs match the Cool Blue or Buttercream front border?
They can, but the widths do not need to match. A wide Buttercream opening with narrow matching cuffs creates repetition while keeping the front edge dominant. Using the body color at the cuffs produces a quieter result.
How do granny stitches affect Cool Blue and Buttercream placement?
Granny stitches already create visible horizontal and open-space rhythm. Keeping several rows in one shade lets the stitch structure remain clear, while frequent color changes create a more obvious striped or patchwork effect.
Can Cool Blue and Buttercream be used equally?
Yes, but equal visual weight does not require equal stitch counts. A dense Cool Blue ribbed frame may look as prominent as a larger Buttercream lace body. Judge the completed textures together rather than trying to divide yarn coverage precisely in half.
How can I check Cool Blue and Buttercream contrast before starting the cardigan?
Work small samples in the body and border stitches you plan to use, then place them together. A grayscale photo can also help show whether cuffs, borders, or joins remain distinct by light-dark value.
Can a regular oversized cardigan tutorial support a cocoon-cardigan color idea?
Yes for features such as cuffs, pockets, ribbing, front bands, and oversized proportions, but a conventional cardigan and a cocoon cardigan do not necessarily share the same construction. Follow the source for the garment it actually demonstrates and make any cocoon adaptation independently.
What should I preserve if the exact Cool Blue or Buttercream shades are unavailable?
Keep their relationship. Choose a clearly cool blue for the main blue role and a warm, pale cream for Buttercream. Preserve enough value or temperature contrast that borders, cuffs, joins, and textured sections remain distinguishable.