How to Choose Swimwear for Your Body Type: A Practical Fit Guide

Quick answer

Choose swimwear by your largest measurement first, then adjust the cut to balance your shape: high-waisted and full-coverage bottoms for pear shapes, textured or ruffled tops for smaller busts, and V-neck or wrap styles for fuller busts. If you need period protection, size period swimwear to your usual underwear size and check the absorbency and gusset coverage before you buy.

Swimwear shopping goes better when you stop chasing a trend size and start with three numbers: your bust, your natural waist, and your fullest hip. Those measurements tell you which size to order and which cuts will actually feel comfortable when wet, moving, and sitting down.

This guide walks through the decision rules for common body shapes, then covers the extra fit questions that come with period swimwear, where coverage and gusset placement matter as much as the look.

Start With Measurements, Not Labels

Measure your bust at the fullest point, your waist at the narrowest point, and your hips at the fullest point, keeping the tape level and snug but not tight. Swimwear sizing usually follows your largest measurement, so if your hips measure into one size and your bust into another, order the larger size and adjust the top separately. If you are between sizes, size up for comfort and use adjustable ties or straps to fine-tune the fit.

Fabric matters too. Swim fabric with a water-repellent and chlorine-resistant treatment, like the textured wave fabric used in Love Luna swimwear, holds its shape and color through repeated pool use. A buttery-soft, fully lined fabric feels smoother against the skin and reduces the chance of a suit digging in at the seams.

• Measure over your usual underwear, not over clothes, for the most accurate numbers.
• Re-measure before every new purchase; bodies change and so do swimwear size charts.

Match the Cut to Your Shape

Pear shapes, where hips are wider than the bust, usually look balanced in a high-waisted or full-coverage bottom paired with a top that adds interest up top, such as a textured or triangle style. This draws the eye upward without adding bulk at the hip. A high-waisted brief also smooths the midsection and stays put when you swim.

Apple shapes, with a fuller midsection and narrower hips, tend to feel best in one-piece styles or high-waisted bottoms with a supportive top. Rectangle shapes can create curves with ruffles, color blocking, or a belted waist. Inverted triangle shapes, with broader shoulders and narrower hips, often prefer halter or scoop tops and bottoms with side ties or patterns that add visual width at the hip.

• If you are short-waisted, a high-cut leg lengthens the look of your torso.
• If you are long-waisted, a one-piece with a seam or belt at the waist breaks up the line.

Fit Checks Before You Commit

Try the suit on and move: raise your arms overhead, squat, and bend forward. The straps should stay on your shoulders without digging, the band should sit flat against your ribcage, and the leg openings should not gap or cut in. If the gusset pulls or the cups wrinkle, the size or cut is wrong, not your body.

For period swimwear, the fit check has one extra step. The absorbent gusset needs to sit flush against your body from front to back, with no gaps at the edges. A suit that is too loose lets water and flow move around the gusset; one that is too tight can cause chafing. Check that the gusset covers the full length of your usual pad or liner, and confirm the absorbency level matches your flow.

• Wear the suit for a few minutes at home before removing tags, if the retailer allows returns.
• Rinse period swimwear in cold water right after wearing to protect the absorbent layers.

Period Swimwear: Sizing and Coverage Rules

Period swim bottoms are built like regular period underwear, with multiple protection layers, but with a water-repellent outer fabric. That means the size that fits your body is the size that protects you: order your usual underwear size, not a size down. If you are between sizes, size up so the gusset lies flat rather than stretching and thinning.

Coverage is the other half of the equation. A full brief style gives more gusset length and a higher waist, which suits heavier days or overnight wear. A bikini or midi cut works for lighter days or backup protection. If you are buying for a teen, look for junior sizing and a crop or one-piece cut that stays in place during activity.

• Match absorbency to your flow: light, moderate, or heavy, and change out of period swimwear after swimming.
• A snug but not tight fit keeps the gusset in contact with your body, which is what makes the layers work.

Decision rules for your swimwear purchase

• If your hips are your largest measurement: Choose a high-waisted or full-coverage bottom and add interest at the top with a textured or triangle style. Order the size that fits your hips and adjust the top separately if needed.
• If you need period protection in the water: Pick period swimwear in your usual underwear size and check that the gusset runs from front to back without gaps. Size up if you are between sizes so the absorbent layers stay flat against your body.
• If you are buying for a teen: Look for junior sizing and a crop or one-piece cut that stays in place during swimming and sport. Confirm the absorbency level matches her flow before relying on it alone.
• If you swim in chlorinated pools often: Prioritize fabric with a chlorine-resistant treatment so the suit keeps its shape and color. Rinse in cold water after every swim to extend the life of the fabric.

Product facts that affect fit

• Adult Period Swim Full Brief - Dusk: Features four protection layers and a water-repellent fabric that keeps your period locked away in and out of the water, in a flattering high-waisted full brief. The full brief cut gives more gusset coverage and a higher waist, which suits heavier days, longer swims, or anyone who wants extra security.
• Teen First Swim Bikini Crop - Black: Made for tweens and teens in junior sizes, fully lined, with a buttery-soft fabric and a water-repellent treatment designed to last the lifetime of the garment. Junior sizing and a crop top cut give younger swimmers a secure fit without adult proportions, and the lined fabric reduces show-through.
• Swim Textured Triangle Bikini Top - Electric Blue: Made from a textured wave-pattern fabric with a water-repellent and chlorine-resistant treatment, designed to match back with Love Luna period swim bottoms. The textured fabric adds visual interest up top, which balances wider hips, and the chlorine resistance helps the suit last through regular pool use.

Who this advice fits

Best for

• Anyone choosing a first or replacement swimsuit and unsure which cut suits their shape
• Swimmers who want period protection in the water and need help sizing it correctly
• Parents buying junior swimwear for a teen's first period

Not for

• Competitive swimmers who need technical racing suits with specific compression and FINA approval
• Shoppers looking for custom-made or tailoring-based swimwear

Fit comes down to measurements, cut, and one honest try-on. Start with your largest measurement, choose a cut that balances your shape, and if you need period protection, treat the gusset fit as seriously as the look. Get those three things right and you will stop dreading swimwear shopping.