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Marblehead Swimsuit

Style and support for large boobs in a swimsuit, all without an underwire? It’s possible with the Marblehead Swimsuit!

Featuring Cashmerette’s famed non-wired support in cups C-J, the Marblehead offers two styles of top—a bikini top or tankini—and a classic swimsuit bottom with two rise options. The fun tie style hides a fantastically supportive integrated soft bra—and it opens in the front, so no need to reach behind your back.

Choose from different options to get the right level of support, and then head to the beach without worrying about wardrobe malfunctions!

Why it’s special:

Built-in bra

C-J cups

Incredible support & shaping for big boobs

More like this: Swimsuits / Activewear / Knits

Marblehead Swimsuit

Free with Club
10 Reviews

Front-closing bikini and tankini sewing pattern with amazing support for big boobs thanks to a built-in wireless bra with over 120 sizes.

This is a Cashmerette Club exclusive pattern. Join 5,000+ curvy sewists from around the world and download this pattern instantly when you join the Club!

Learn more

Why it’s special:

Built-in bra

C-J cups

Incredible support & shaping for big boobs

More like this: Swimsuits / Activewear / Knits

Style and support for large boobs in a swimsuit, all without an underwire? It’s possible with the Marblehead Swimsuit!

Featuring Cashmerette’s famed non-wired support in cups C-J, the Marblehead offers two styles of top—a bikini top or tankini—and a classic swimsuit bottom with two rise options. The fun tie style hides a fantastically supportive integrated soft bra—and it opens in the front, so no need to reach behind your back.

Choose from different options to get the right level of support, and then head to the beach without worrying about wardrobe malfunctions!

Why it’s special:

Built-in bra

C-J cups

Incredible support & shaping for big boobs

More like this: Swimsuits / Activewear / Knits

Units:
Sizes:

Body Measurements (in)

Bikini & Tankini

Under bust measurement (in) 28-29 30-31 32-33 34-35 36-37 38-39 40-41 42-43 44-45 46-47 48-49 50-51 52-53 54-55
Band size 28 30 32 34 36 38 40 42 44 46 48 50 52 54
Full bust (in)                            
31 28C                          
32 28D                          
33 28DD 30C                        
34 28E 30D                        
35 28F 30DD 32C                      
36 28G 30E 32D                      
37 28H 30F 32DD 34C                    
38 28I 30G 32E 34D                    
39 28J 30H 32F 34DD 36C                  
40   30I 32G 34E 36D                  
41   30J 32H 34F 36DD 38C                
42     32I 34G 36E 38D                
43     32J 34H 36F 38DD 40C              
44       34I 36G 38E 40D              
45       34J 36H 38F 40DD 42C            
46         36I 38G 40E 42D            
47         36J 38H 40F 42DD 44C          
48           38I 40G 42E 44D          
49           38J 40H 42F 44DD 46C        
50             40I 42G 44E 46D        
51             40J 42H 44F 46DD 48C      
52               42I 44G 46E 48D      
53               42J 44H 46F 48DD 50C    
54                 44I 46G 48E 50D    
55                 44J 46H 48F 50DD 52C  
56                   46I 48G 50E 52D  
57                   46J 48H 50F 52DD 54C
58                     48I 50G 52E 54D
59                     48J 50H 52F 54DD
60                       50I 52G 54E
61                       50J 52H 54F
62                         52I 54G
63                         52J 54H
64                           54I
65                           54J

 

Tankini

Band size  28 30 32 34 36 38 40 42 44 46 48 50 52 54
Waist 26 28 30 32 34 36 38 40 42 44 46 48 50 52
Hip 36 38 40 42 44 46 48 50 52 54 56 58 60 62

Bottoms

  0 2 4 6 8 10 12 14 16
Waist 25 26 27 28 29 30 1/2 32 34 36
Hip 35 36 37 38 39 40 1/2 42 44 46

Finished Garment Measurements (in)

Tankini

Band size 28 30 32 34 36 38 40 42 44 46 48 50 52 54
Waist 30 3/4 32 1/2 34 1/4 36 37 3/4 39 1/2 41 1/4 43 44 3/4 46 1/2 48 1/4 50 51 3/4 53 1/2
Hip 36 38 40 42 44 46 48 50 52 54 56 58 60 62

Bottoms

  0 2 4 6 8 10 12 14 16
Waist, Higher Rise 21 3/8 22 3/8 23 3/8 24 3/8 25 3/8 26 7/8 28 3/8 30 3/8 32 3/8
Waist, Lower Rise 22 5/8 23 5/8 24 5/8 25 5/8 26 5/8 28 1/8 29 5/8 31 5/8 33 5/8
Hip, All Rises 26 3/4 27 3/4 28 3/4 29 3/4 30 3/4 32 1/4 33 3/4 35 3/4 37 3/4
Total Crotch Length, Higher Rise 21 1/4 22 22 3/4 23 1/2 24 1/4 25 25 3/4 26 1/2 27 1/4
Total Crotch Length, Lower Rise 18 3/4 19 1/2 20 1/4 21 21 3/4 22 1/2 23 1/4 24 24 3/4

Fabric Requirements (yd)

Bikini & tankini

Main fabric 28-32 34-40 42-48 50-54
45" wide, View A - bikini 1 1 1 1/4 1 3/8
45" wide, View B - tankini 1 3/8 1 5/8 1 3/4 2
55" wide, View A - bikini  3/4  7/8 1 1 1/8
55" wide, View B - tankini 1 1/8 1 1/4 1 1/2 1 5/8
Lining 28-32 34-40 42-48 50-54
45" wide, All Views  1/2  1/2  5/8  3/4
55" wide, All Views  1/2  1/2  5/8  5/8
Back lining 28-32 34-40 42-48 50-54
45" wide, All Views  1/2  1/2  5/8  5/8
55" wide, All Views  1/2  1/2  5/8  5/8

Bottoms

Main fabric 0-16 range: 0-8 0-16 range: 10-16 12-32 range: 12-20 12-32 range: 22-32
45" wide, All Views  5/8  5/8 1 1/8 1 1/4
55" wide, All Views  5/8  5/8  3/4 1
Lining 0-16 range: 0-8 0-16 range: 10-16 12-32 range: 12-20 12-32 range: 22-32
45" wide, All Views  5/8  5/8 1 1/8 1 1/4
55" wide, All Views  5/8  5/8  3/4 1

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Units

Your Cashmerette Size Results

Our patterns are designed for curves in cup sizes C-H. If your cup size is smaller proportionally to your shoulders than our C/D cup size, you will need to do a small bust adjustment. To calculate how much width you need to remove from your pattern piece, divide the total SBA amount needed by two (as the pattern piece represents half the garment). How to do an SBA >

Our patterns are designed for curves in cup sizes C-H. If your cup size is larger proportionally to your shoulders than our G/H cup size, you will need to do a full bust adjustment. To calculate how much width you need to add to your pattern piece, divide the total FBA amount needed by two (as the pattern piece represents half the garment). How to do an FBA >

Your measurements put you in more than one size, so you will need to grade between sizes to achieve your personalized fit. How to grade between sizes >

We need to ask you a few more questions to get your starting size.

Please contact us with your measurements.

We need to ask you a few more questions to get your starting size.

Please contact us with your measurements.

We need to ask you a few more questions to get your starting size.

Please contact us with your measurements.

Frequently Asked Questions

  • 5 stars: 9 (90%)
  • 4 stars: 1 (10%)
  • 3 stars: 0 (0%)
  • 2 stars: 0 (0%)
  • 1 star: 0 (0%)
A
Angela Bell
Excellent tankini pattern that solved my vacation swimsuit dilemma

This is a fabulous pattern that was a reasonably easy make and came just in time for my pacific island holiday. I didn't find the waist elastic method for the bottoms worked for me at all (you only attach it along the top edge, but for me it kept flipping up) so I ended up stitching it down. Still looks great, would absolutely recommend this pattern for great wireless support.

C
Carol Greene
Marblehead

I started it a couple months back. Not finished. When I tried the top on the cups looked way too small. I plan to finish it (put the band on) and try on again. I have made lots of williwdale bras and probably made the same size

Loved you capsule wardrobe you looked stunning and enjoyed that you said you made several things wrong but it still looked Great. I am 78 and have been sewing since before High school. I make a mistake in everything I make again only I know.

K
Kayla
Four kids, five swimsuits, and this is the best

I have spent seven years and four kids in search of a swimsuit that is 1) supportive, 2) breastfeeding friendly, 3) conservative and comfortable enough to chase boys all day. This is it! The clasp closure makes it easy to feed the baby. The bra base makes it comfortable and supportive. Pair it with the Wickham skirt and the Bonair top and I won’t be flashing anyone at the beach. I live in this swimsuit.

J
Jennifer Carvalho
Another one knocked out of the park!

The fit is amazing... ! Right out of the box! I think mainly because the bust is supported by the well designed loftus engineering. The racer back design is also thoughtfully designed to hide back fluff... at least it worked with me. The bottoms (I made the higher rise) are comfortable and secure. After the first child, vogue could no longer help me with bathing suits and after many, many years cashmerette comes along and designs suits with structure, support and comfort. Well done, Ms. Rushmore!

H
Heather
Supportive and cute swim wear!

I have only made the top, so only reviewing that here. The fit and support and security of this top are amazing. This is hands down the best swim top I've ever made or owned. Detailed instructions walk you through the detailed process. I felt cute and confident and well supported in this over many many hours in the water and on the beach. I like the look and fit adjustment of the tie front. It does look bumpy if wearing under a rashguard.

C
Colleen Gee
Love this pattern!!!

I love all my cashmerette patterns. They are so fun and made just for my plus boobs!!

R
Rebecca Swartz
Amazing fit with no modifications!

I made this in a 38H and was really sceptical about the amount of support it could actually give. But boy was I wrong! The fit is incredible and the suit is so comfortable. I haven’t tested it in the water yet but it feels super secure so I’m not worried about any wardrobe malfunctions! Thanks Cashmerette for this feat of engineering!

C
Cheryl Sanderson
Pattern looks great

I haven't made the pattern yet but I'm looking forward to making the tankini. I'm an advanced beginner so may need to improve my skills before starting this.

B
Bridget May
Building up to it

It looks a great pattern but I’ve not made it yet. The uk weather has not inspired me.
I was a little underwhelmed by the kit choices this time.

C
Clare Curtis
What a fabulous pattern!

I’ve just finished my first Marblehead tankini and I love it! For years I’ve worn expensive underwired bikinis and swimsuits and have never enjoyed the fit, comfort or lack of support when wearing them. Despite spending a lot of money on the best available.

The Marblehead is so cleverly designed. The support is amazing and it’s so comfortable. It looks fabulous too. I can’t quite believe how good it is. I can’t wait to make the next one, so I’ll be starting that this afternoon…

The sew along by Whitney is excellent as always. Part way through the bra section she says “trust the pattern”. I definitely got to the stage when I thought , this just isn’t going to work for me, and fit, but it does!

Thank you for designing this for us.

Clare

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