Women's Swimwear Size & Fit Guide

Smart Jumps (Pick With Confidence)

Choose what you care about — and we’ll take you straight to the solution.

Get my size fast

Instant size range + confidence note (best first step).

Help me pick the right swim style

Choose your vibe + support + coverage, then get matched to the best types.

I’m between sizes

Swim fit rules that prevent squeezing, gaping, and ride-up.

Support worries (bust)

Underwire, molded cups, straps, and what actually holds in water.

Coverage & comfort worries

High-waist, swim skirt, rashguard, tummy control—choose the right cut.

Plus size fit

Comfort + stay-put + smart coverage.

Your calm checkout checklist

You confirmed size using Instant Finder (Option A or B).
You chose a style that matches your support + coverage needs.
You picked for your activity: lounging vs swimming vs sport.

Instant Swimwear Size Finder

Fastest path to confidence. Choose a size system (Alpha / US / UK / EU), or choose your measurements — and we’ll return the safest starting point.

Option A: Pick your size (Alpha / US / UK / EU)

We’ll show the matching measurements + quick fit logic.

Size system

Select size

Option B: Enter your measurements

All menus are populated. Choose your numbers—no typing needed.

Unit

Bust

Waist

Hips

Torso (optional)

Swim Style Recommender

Tell us your vibe + support + coverage + activity — and we’ll recommend the best swim types for you.

Pick your needs

Vibe

Support level (bust)

Coverage

Activity

Your recommendations

Quick tip

For water: secure band + stable straps beat “looks tight” every time. Comfort is what stays flattering.

Swim Fit Rules (So you don’t second-guess)

The 3 rules that prevent returns

Band first: If the top has a band, it should feel snug (not painful). That’s support.
No dig / no gap: Avoid deep digging at edges and gaping cups—both show up more when wet.
Bottom stays put: If it rides up dry, it will ride up more in water. Choose a more stable cut.

Between sizes: choose comfort Active day: prioritize secure cuts One-piece: torso matters

How to measure (fast)

Bust

Measure the fullest part of your bust, tape level and relaxed.

Waist

Measure the narrowest point above the belly button. Breathe normally.

Hips

Measure the fullest part of hips/seat. This controls bottom fit and leg opening comfort.

Torso (for one-pieces)

Start at shoulder, go down through legs, and back up to the shoulder (like a loop). If torso is long, look for adjustable straps or “long torso”.

Support & Structure (Tops, One-Pieces, Active Styles)

The right structure is what feels secure in motion and in water.

Maximum support

Underwire
Molded cups
Wide straps
Thicker band / clasp back

Balanced support

Halter
Bralette bikini
Longline top
One-piece with shelf bra + adjustable straps

Light support (best for lounging)

Triangle
String tie
Bandeau (best with gripper)

Active day essentials

Best top shapes

High-neck bikini, sporty bralette, or underwire with secure straps. Avoid loose triangles for activity.

Best bottom shapes

Mid/high-rise with wider sides, boyshorts, or surf-style bottoms. Avoid ultra-thin sides for motion.

Best one-pieces

Adjustable straps, supportive band, and stable leg openings. “Tummy control” panels can add structure.

Plus Size Fit (Comfort + Stay-Put)

What makes swimwear feel secure

Supportive band (or underwire)
Adjustable straps
Wider side panels on bottoms
Rashguard / swim tee options for extra coverage
High-waist or swim skirt for comfort

Your safest sizing approach

Choose the size that feels comfortable at your controlling measurement. If you want more hold, choose a supportive construction (band/underwire) instead of sizing down.

Swimwear Size Chart (Alpha / US / UK / EU)

Use this chart as a guide, then confirm with Instant Finder (especially if you’re between sizes).

Alpha	US	UK	EU	Bust (in)	Waist (in)	Hips (in)	Bust (cm)	Waist (cm)	Hips (cm)

Quick conversion note

UK is often US + 4, and EU is often US + 32 — but brands vary. When in doubt: prioritize comfort, then pick supportive construction for a more “held” feel.

Swimwear Types (All Styles)

Filters only (easy). Choose what you want, and the list updates instantly. Each type has a plain-English definition.

Category

Support

Coverage

Vibe

Search (optional)

Sort

Classic One-Piece

The easiest “looks good on everyone” choice. More coverage, stable fit, and less adjustment during the day.

Most lovedLow riskStay-put

Triangle Bikini

Light support and an adjustable look. Best for lounging and tanning, not ideal for high activity.

TanningAdjustableLight support

Underwire Bikini Top

Maximum lift and shaping. Great for fuller busts and anyone who wants strong support.

Max supportLiftSecure

Bralette Bikini Top

Balanced comfort and a stable feel. Great for pool days and casual swimming.

BalancedComfortEasy

One-Piece With Underwire

One-piece coverage with bra-like support. Great for fuller busts and a more held-in feel.

SupportiveStructuredSecure

Tummy Control One-Piece

Smoothing panels for a more sculpted look without sizing down. Comfort-first confidence.

SmoothingComfortConfidence

Tankini

Two-piece convenience with more coverage. Easy bathroom breaks and adjustable styling.

More coveragePracticalEasy

Rashguard / Swim Tee

Maximum coverage and active-friendly. Great for sun protection and water sports.

ActiveSun protectionSecure

High-Waist Bikini Bottom

More coverage and a stable feel at the waist. Great for comfort and a retro silhouette.

RetroStableComfort

Swim Dress / Skirted

Extra coverage at the hip and upper thigh. A comfort-first option for pool days.

More coverageComfortEasy

High-Neck Bikini Top

More secure neckline, great for swimming and activity. Less adjusting, more confidence.

Active-friendlySecureSporty

String Bikini

Maximum adjustability, minimal coverage. Best for tanning and low activity.

MinimalAdjustableTanning

Monokini / Cut-Out One-Piece

One-piece vibe with cut-outs. Bold and chic, but less forgiving for movement.

BoldResortStatement

Safe sizing reminder

If you’re between sizes: choose comfort first. For more hold, pick a more supportive build (band/underwire/wide straps) instead of sizing down.

Fix Fit Issues (All Common Problems)

Swimwear should feel secure, not painful. Here’s how to fix every common situation.

Top band feels too tight

If you can’t breathe comfortably, size up. For more support, choose underwire/molded cups or a thicker band rather than going tighter.

Cups gape

Try a smaller cup shape (triangle → underwire / molded), tighten straps, or choose a style with adjustable back and more structured cups.

Spillage (top edge or sides)

Choose a more supportive cup shape (underwire, balconette, molded) or size up. Spillage gets worse when wet.

Bottom rides up

Choose a bottom with wider sides, more coverage, or a higher rise. If it rides up dry, it will ride up more in water.

Leg openings dig in

Pick a cut with softer leg openings, more coverage, or size up. Digging makes marks and discomfort.

One-piece feels short (wedgie / pulling)

That’s torso length. Look for adjustable straps, long-torso options, or size up if torso is the controlling issue.

Straps slide

Choose adjustable straps, cross-back, or a more stable back. Sliding straps usually mean the band isn’t doing enough work.

It feels fine dry, bad wet

Wet fabric can relax and shift. Choose more secure designs: thicker bands, underwire, stable bottoms, and better coverage for active days.

FAQ

What if I’m between sizes?

Choose comfort first. For more “held” feel, choose supportive construction instead of sizing down.

How should swimwear feel when it fits?

Secure and stable without pain. No sharp digging, no major gaping, and bottoms should stay put when you walk.

Do one-pieces fit differently?

Yes—torso length matters. If it pulls at the shoulders or rides up, look for adjustable straps or long-torso options.