The One Black


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Size Guide Fit Quiz

Warranty: 30 Days

This classic one piece is engineered to sculpt your body and support your bust just like shape wear. Recycled Italian sculpting fabric, seamless construction, hidden in built underwire bra and a scooped low back makes this style an essential for D+ women.

Jemimah wears size 30E
Mercy wears size 34G
Fits true to standard bra sizes
Adjustable straps
Low scoop back
Hidden in-built underwire bra
Fully lined with second skin lining
Recycled Italian sculpting fabric

78% of our Italian fabric is made from recycled waste, like fishing nets, fabric scraps, carpet flooring and industrial plastic from landfills and oceans all over the world.

2 x more resistant to chlorine
2 x more resistant to suntan oils & creams
Excellent UV protection
Unrivalled shape retention
Care: rinse after chlorine & hand wash cold

30 day returns

Full priced items

Size Exchange:
Full priced and sale items up to 60% off, Australia only

Store Credit:
Sale items

Final sale no returns:
Items 60% off and above

Full returns policy here.

Australia Post Express (1-2 business days)
Orders over AU$240: FREE
Orders under AU$240: AU$10

United States:
FedEx Priority (4-6 business days)
Orders over US$175: FREE
Orders under US$175: US$20

United Kingdom:
FedEx Priority (4-6 business days)
Orders over £125: FREE
Orders under £125: £15

FedEx Priority (4-6 business days)
Orders over CA$225: FREE
Orders under CA$225: CA$25

New Zealand:
Australia Post Express (2-4 business days)
Orders over NZ$250: FREE
Orders under NZ$250: NZ$15

Rest of World:
FedEx Priority (4-6 business days)
Orders over AU$240: FREE
Orders under AU$240: AU$25

Shipping timeframes are estimates only. Full shipping policy here.



Customer Reviews
4.6 Based on 86 Reviews
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Katy L.
  • Size Purchased 36F
Looks great, could feel a bit better

I love the look of the swimsuit, it’s very flattering and supportive whilst being minimal and stylish. The wires in the cups dig in a little bit - this might be a sizing issue but I went with the suggested size and the fit does feel right. The swimsuit is also very high cut on the rear and rides up a bit. Overall I’m happy with it though as I wanted a suit that looked super minimal with a low back which is so hard to find in bigger cup sizes.

  • Size Purchased 30G
Great fit - very flattering

I have always avoided buying once pieces as I am quite a small frame with large bust, and find I can never get quite the right fit with enough support and not look dowdy. This swimsuit is amazing - very flattering, ver supportive and not at all dowdy! 10 out of 10

  • Size Purchased 34E
Wonderful, minimal design

Love that there is finally a nice, clean, minimal swimsuit designed for D+ women. The 34 is a little tight over the hips and there isn't a lot of give when putting them on, but this firmer shape definitely looks good on.

  • Size Purchased 32E
Seriously impressed.

Never found a swimsuit or bra that has fit as well as this has. As someone who wears size 8-10 normal dress size but has size E/F breasts, finding flattering and still stylish swimmers has been near impossible and constant source of anxiety..until now! Functional, fashionable and fits perfectly! Wish they started making lingerie too….

Arabella C.
  • Size Purchased 10E
Fits like a dream

The perfect combination of support + sexy. I can jump in the surf and don’t need to worry about anything falling out (!). Love the colour too - a really beautiful rich red.

How It Supports You

How It Supports You
A classic shape with a scooped open back and brief to mid rear coverage
Recycled Italian fabric feels like a second skin and sculpts the body like shape-wear
Hidden in built underwire bra and adjustable straps for the ultimate support

Easy and simple, like it should be.

Fit Quiz

Find the right size and style in 90 seconds with our fit quiz designed by our team of expert Fit Specialists.

Fit Specialists

When your order arrives, our team of Fit Specialists are here to help with any size or style questions.

30 Day Refunds

Try your order and if you don't love it for any reason we'll take full-priced items back for a refund.