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  • A woman modeling a Black one-piece swimsuit with a keyhole cutout at the chest, posed against a textured beige studio backdrop.
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Plunge One Piece Swimsuit

$249
$249
Why It's Worth It
Shipping calculated at checkout.

or 4 X $62.25 with

Arriving November 2026.
Chic deep plunge, open back - designed for either smaller or fuller busts.
B-D cup has a built-in shelf bra. DD-F has hidden underwire for lift and support.

Bum coverage:

Bum coverage: Medium

Bust Support:

Bust Support: Medium

Compression:

Compression: Medium

Leg Cut:

Leg Cut: Medium to High

Colour: Black
Cup Size

* B-D cup has a built-in shelf bra

Size US 4 / AU 8 / EU 36
XS US 4 / AU 8 / EU 36
S US 6 / AU 10 / EU 38
M US 8 / AU 12 / EU 40
L US 10 / AU 14 / EU 42
XL US 12 / AU 16 / EU 44
2X US 14 / AU 18 / EU 46
3X US 16 / AU 20/ EU 48

Size Guide

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Fit

Snug True to size Relaxed

Compression

Low Moderate Maximum

Details

Arriving November 2026.

We're tired of seeing the best swimwear styles made for smaller busts, leaving everyone else to choose between looking good and feeling supported. So we made a swimsuit that gives you both.

The deep plunge, open back and low-cut shape you've been wanting, with support designed around your bust. Choose B-D for a built-in shelf bra or DD-F for hidden underwire that lifts, separates and holds you in, without covering up the good bits.

• BUST SUPPORT - Choose B-D with a built-in shelf bra and removable cups or DD-F with hidden underwire for extra lift and support
• PLUNGE - Deep plunge neckline across both cup options
• BACK - Open back with side back coverage and an easy brushed-gold clasp
• DETAILS - Custom gold centre-front clasp that can be undone making it easy to get on an off
• COVERAGE - Medium bum coverage with a medium-high leg line
• FABRIC - Smooth, matte fabric with a luxe finish
• FIT - Between sizes? Size down. XS-3X (Australian sizes 8-20).

Because a bigger bust shouldn't mean sitting out the styles you love. Get the plunge and get the support, you can have both.

Shop All One Pieces

Fabric & Care

This swimsuit is crafted from an ultra matte, silky smooth fabric - so sleek you can wear it as a bodysuit too. (Double the outfits from one purchase!)

Outer: 75% recycled nylon, 25% elastane
Lining: 86% polyester, 14% elastane
Power mesh: 72% nylon, 28% elastane

Sustainability isn’t just about recycled materials - it’s about choosing high quality pieces designed to last for seasons. With the right care, your Fearless swimwear will keep looking incredible year after year.

Care Tips:
  • Rinse in fresh water after every wear, especially after pools or spas
  • Cold hand wash or gentle cold cycle
  • Avoid tumble drying, bleaching, soaking or ironing
  • Dry in the shade

Then treat yourself to a nap - because laundry is the worst.

Country of Origin: China

What’s My Size

We recommend checking your measurements against our size & fit guide before ordering. Good news is we do offer exchanges and refunds if the size isn’t spot on.

That said, it's a compressive swimsuit, designed to help you feel held and supported (like wearing your favourite activewear)!

ABOUT OUR MODELS:

Lyndi wears Size Small/AU 10/US 6
Height: 165cm (5’5”)
Cup: C

Shima wears Size Small/AU 10/US 6
Height: 171cm (5’6”)
Cup: B

Liz wears Size Small/AU 10/US 6
Height: 178cm (5’8”)
Cup: D

Alana wears Size Large/AU 14/US 10
Height: 173cm (5’6”)
Cup: DD

Laura wears Size Large/AU 14/US 10
Height: 178cm (5’8”)
Cup: G

Jessie wears Size 2X/AU 18/US 14
Height: 171cm (5’6”)
Cup: F

Delivery & Returns

Standard and express shipping available depending on your region.

Easy returns: 14 day money back guarantee on all full price orders. We offer exchanges, 110% of your purchase price as store credit or refunds on all full-price orders.

Click here for our full returns policy and all shipping info.

FAQs

Does this have underwire?
Yes, if you choose the DD-F cup option. It has hidden underwire for extra lift and support without changing the look of the plunge. The B-D cup option has a built-in shelf bra instead.

What bust sizes does it suit?
It fits B-F cups, with two cup options to choose from. Choose B-D for the built-in shelf bra or DD-F for hidden underwire and extra support.

Is this a high-support style?
The DD-F cup option offers more support with hidden underwire, while the B-D option gives lighter support with a built-in shelf bra. Both are designed around the same deep plunge shape.

Does the plunge change between cup sizes?
No. Both cup options have the same deep plunge shape. Because a fuller bust shouldn't mean giving up the neckline you actually want.

Does it run true to size?
If you're between sizes, size down. For your best fit, we recommend checking your measurements against our size guide.

Is the back really open?
Yes. The back is beautifully open with side back coverage, giving you plenty of skin without completely losing the coverage and support you want from a one-piece.

What's the coverage like?
Medium bum coverage with a medium-high leg line. Enough coverage to feel comfortable moving around, with a leg line that still gives you some shape.

What's the fabric like?
Smooth, matte and luxe. It's designed to sit cleanly against the body and give the swimsuit a polished finish.

What are the gold details?
There's a custom gold clasp at the centre front and a brushed gold clasp at the back. The back clasp also makes getting in and out of the swimsuit much easier.

Can I wear it if I have a fuller bust?
Absolutely. That's exactly what the DD-F cup option is designed for. The hidden underwire gives you extra lift and support while keeping the deep plunge shape intact.

Can I wear it as a bodysuit?
Absolutely. The plunge neckline and open back make it just as good with jeans, linen pants or a skirt as it is with swimmers.

Are colours true to photos?
Yes. Colours are photographed in natural light, though slight variation can occur depending on screen settings.

Style With

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View full details

Fabrication: Core Smooth

  • Fearless premium luxe smooth fabric in black. Fearless swimwear is designed to withstand ocean swims, pool laps and long summer days - not stretch out after a handful of wears.

    Texture

    Smooth, ultra matte

  • A black one-piece swimsuit with a plunging V-neckline and a central cutout accent, shown on a plain white background with curved arrows indicating a shaping or slimming effect.

    Benefits

    Waist cinching

  • A woman wearing a black one-piece swimsuit stands on a sandy beach with water and trees in the background. The swimsuit has a deep V-neckline with a small cutout detail at the center front.

    Wear to

    Beach, pool, sauna

  • A woman modeling a one-piece black swimsuit with a plunging V-neckline and a small gold-tone keyhole cutout at the center, posed against a textured beige studio backdrop.

    Best for

    Relaxed feel, disguising texture

Why You Can Trust Our Sizing

We surveyed 15,000 women before designing a single item and we're still listening.

Every item is fitted and tested on two sizes - a 10/12 (C-Cup) and a 14/16 (E-Cup) - then trialled on real women in their 20s to their 60's. Because no two bodies are the same.

When our fabric ran small, we changed the sizing. Feedback beats data, every time.

Sizes XS-3X. Built for the body you actually have.

As Seen On

  • Plunge One Piece Black

    Jessie wears size 2X, F cup, 171cm

  • Plunge One Piece Black

    Jessie wears size 2X, F cup, 171cm

  • Plunge Black

    Keeley wears size M, E cup, 158cm

  • Plunge black

    Keeley wears size M, E cup, 158cm

  • Plunge Black

    Liz wears size S, D cup, 178cm

  • Plunge Black

    Alana wears size L, DD cup, 173cm

Still Not Sure?

Finding a swimsuit that actually sculpts, supports and survives the ocean without a wardrobe malfunction? We used to think that was a myth too. Don't take our word for it - real women are already raving about the fit, the comfort and the "wait, this actually works" confidence Fearless delivers.