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Woman in a colorful bikini standing by a body of water with mountains in the background. String bikinis for ocean lovers with ocean-inspired prints.

Find your perfect fit

String Bikini Set Size Guide
👙

Best fit for A–C cups. The full-coverage cut suits a wide range of bodies. The front is fully lined for coverage but has no built-in cups. Wear a swim bra underneath if you want more support.

📏

Measure yourself, not a garment you own. The one-piece swimsuit runs true to size. If you're between sizes, we recommend sizing up.

1

Measure Yourself

How to measure chest and bust

Chest / Bust

Tap to see how
How to measure waist

Waist

Tap to see how
How to measure hips

Hips

Tap to see how
Chest / Bust — Wrap the tape around the fullest part of your chest, keeping it parallel to the floor. Bring the tape under your armpits and across your shoulder blades. Don't pull too tight.
Waist — Find the narrowest part of your torso, usually just above your belly button. Stand naturally — don't hold your breath or pull in your stomach.
Hips — Stand with feet together. Wrap the tape around the fullest part of your hips and seat, parallel to the floor — usually about 8–9 inches below your natural waist.

🔍  Find My Size
Unit:
⬆️
Between sizes? The one-piece runs true to size — size up if between sizes for the most comfortable fit.
2

Find Your Size

Size Chest / Bust
inches / cm 		Waist
inches / cm 		Hips
inches / cm
XS 33⅛ in / 84 cm 25¼ in / 64 cm 35⅜ in / 90 cm
S 34⅝ in / 88 cm 26¾ in / 68 cm 37 in / 94 cm
M 36¼ in / 92 cm 28⅜ in / 72 cm 38⅝ in / 98 cm
L 39⅜ in / 100 cm 31½ in / 80 cm 41¾ in / 106 cm
XL 42½ in / 108 cm 34⅝ in / 88 cm 44⅞ in / 114 cm
2XL 45⅝ in / 116 cm 37¾ in / 96 cm 48 in / 122 cm
3XL 48⅞ in / 124 cm 41 in / 104 cm 51⅛ in / 130 cm

Measurements shown are body measurements, not garment measurements. Click any row to highlight your size.


Fit Tips for Diving

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True to size — size up if between

The one-piece swimsuit runs true to size. If your measurements fall exactly on a size boundary, that's your size. If you're between sizes, we recommend sizing up — a slightly roomier fit is more comfortable for a full day in and out of the water.
📐

Size to your chest

For a one-piece, prioritise your chest measurement first. The torso length and bust fit are the hardest to adjust — getting the chest right is the most important factor. If your hips suggest a different size, go with your chest.
🤿

Stays put under your BCD

Our one-piece swimsuit is designed to stay in place through multiple dives. A one-piece is ideal for diving as there's no gap between top and bottom — no riding up, no shifting, no adjustment needed between dives.
🌊

After your first dive

Recycled polyester softens slightly with saltwater and wear. If your one-piece feels snug at first, it will relax a little after the first few dives while maintaining its shape, support, and UPF 50+ protection.
🔀

Which Measurement to Prioritise

If your chest, waist, and hip measurements suggest different sizes, prioritise your chest for a one-piece. The torso fit is set — there's no separate top and bottom to mix. When in doubt, go with the larger size for comfort and range of movement.

 

Still not sure about your size?

We're happy to help before you order — send us your measurements and we'll recommend the best fit.

 

 

Got your size?

Shop String Bikinis → SHOP NOW

Still not sure? Send us your measurements at andrea@thedivecompass.com and we'll tell you your size before you order.

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Corals planted with every purchase in Bali under the save our seas pledge

Your order plants corals

Scuba diving swimsuits, rashguards and leggings with inclusive sizing from XXS to 6XL

Designed for your ocean adventures

Made from sustainable recycled fabrics, eco-friendly swimwear for scuba divers

Made to order = no excess waste

Swimwear made with the highest quality fabrics, quality you can trust

Easy returns, quality guaranteed