Why Body Type Matters When Choosing Swimwear

Buying swimwear online is a gamble most people lose. According to Fit Analytics research, 40% of online swimwear purchases are returned due to fit issues — the highest return rate of any clothing category. That is not because the swimwear is bad. It is because most people choose styles based on what looks good on a model rather than what works with their own proportions.

Source: Fit Analytics, Swimwear Returns & Sizing Report 2024

We see this at our Phuket studio every day. A customer orders a stunning triangle bikini that looked incredible on a 5'10" runway model, and it arrives looking completely different on her 5'4" frame. The style wasn't wrong — it was wrong for her body. A high-waisted set with a structured top would have been transformative, but without guidance, she had no way of knowing that.

The global swimwear market is projected to reach $28.5 billion by 2028, according to Grand View Research. Yet despite the industry's size, most brands still display their pieces exclusively on one or two body types, leaving the vast majority of customers to guess whether a style will actually work for them.

Source: Grand View Research, Global Swimwear Market Report 2024–2028

This guide solves that problem. We break down the five common body types, explain exactly which swimwear styles work best for each, and — this is the part that changes everything — we offer a virtual try-on that lets you see yourself wearing each piece before you spend a single baht. No more guessing. No more returns. Just swimwear that was made for you.

The most flattering swimsuit isn't the most expensive one or the trendiest one — it's the one that works with your body's natural proportions, not against them.

How to Determine Your Body Type

Before you choose a swimsuit style, you need to know your shape. This takes about two minutes and a flexible tape measure. Stand in front of a mirror in underwear or form-fitting clothing and measure three points:

• Bust: Measure around the fullest part of your chest, keeping the tape level.
• Waist: Measure around the narrowest point of your torso, typically just above the belly button.
• Hips: Measure around the widest point of your hips and buttocks.

Now compare those three numbers. Your body type falls into one of five categories:

Best Swimsuit for Hourglass Body

The hourglass figure has balanced proportions — bust and hips are approximately the same width, connected by a noticeably narrower waist. If this is your shape, your primary goal is to highlight that natural waist definition rather than hide it.

Styles That Work

• High-waisted bikinis: The number one recommendation for hourglass shapes. The high waistband sits at your narrowest point, drawing the eye to your waist and creating a classic, elegant silhouette. This is why vintage-inspired swimwear has always been flattering — it was designed for this exact body type.
• Belted one-pieces: A one-piece with a belt or tie at the waist does the same job as a high-waisted bikini — it cinches at the narrowest point and lets your curves do the rest. Look for styles with a slight V-neckline to elongate the torso.
• Wrap-style tops and one-pieces: Wrap designs naturally hug the body and create a crossover effect at the waist, which emphasises the hourglass silhouette beautifully.
• Underwire or structured tops: If you have a larger bust (common with hourglass shapes), a top with built-in support keeps everything secure without the constant strap adjustment that comes with flimsy triangle tops.

What to Avoid

Stay away from shapeless shift-style one-pieces that fall straight from bust to hip — they will erase the waist you want to showcase. Also avoid overly padded tops if you are already full-busted, as they can create a top-heavy look that throws your balanced proportions off.

Best Swimsuit for Pear Shape

Pear-shaped bodies carry width primarily in the hips and thighs, with a narrower upper body. We see this body type more than any other at our Phuket studio, and the styling principle is straightforward: draw attention upward to the shoulders and bust while keeping the lower half streamlined.

Styles That Work

• Bandeau tops: A bandeau creates a strong horizontal line across the bust, which visually broadens your shoulders and balances wider hips. This is one of the most powerful styling tricks in swimwear.
• Halter neck tops: Halter straps draw the eye upward to the neck and shoulders, shifting focus away from the hip area. The diagonal lines also create the illusion of a wider upper body.
• Bold-coloured or printed tops: Pair a bright, eye-catching top with a darker, simpler bottom. The contrast directs attention to your upper half. A coral or patterned top with a black or navy bottom is a classic pear-shape combination.
• High-cut bottoms: A high leg opening elongates the legs and visually narrows the hip area. This does not mean a thong — a modest high cut achieves the same effect comfortably. It is one of the most universally flattering bottom cuts regardless of body type.
• Ruched or gathered side details: Bottoms with side ruching add texture without adding bulk, and the gathered fabric creates a forgiving, organic shape around the hips.

What to Avoid

Skip boy-short style bottoms — they cut across the widest part of the thigh and make hips look broader. Avoid very low-rise bottoms that expose the widest part of the hip. And resist matching your top and bottom in a dark, plain colour — that misses the opportunity to create visual balance.

Best Swimsuit for Apple Body

Apple body types carry weight primarily in the midsection, often with a less defined waist and slimmer legs and arms. The strategy here is to create the appearance of waist definition while working with your body's natural shape — not against it.

Styles That Work

• Ruched one-pieces: Ruching is the apple shape's best friend. Strategically gathered fabric along the torso creates texture that camouflages the midsection while adding dimension. Look for ruching that runs vertically or diagonally rather than horizontally — it creates a slimming, lengthening effect.
• Tankinis: A tankini gives the coverage and comfort of a one-piece with the convenience of a two-piece. The loose hemline of the top skims over the midsection without clinging, and you can choose a length that sits at your most flattering point — usually at or just below the navel.
• High-waisted bottoms with structure: Bottoms with a wide, structured waistband provide gentle support and smoothing through the lower midsection. Look for panels with a slight compression effect — not shapewear-level tightness, just enough to create a smooth line.
• V-neckline tops: A deep V-neckline elongates the torso and draws the eye vertically, creating the illusion of a longer, leaner midsection. This works in both one-pieces and bikini tops.
• Colour-blocked designs: A one-piece with darker panels at the sides and a lighter panel down the centre creates an instant slimming illusion. This is one of the most effective visual tricks in fashion, and it works beautifully in swimwear.

What to Avoid

Avoid string bikinis or any style where the focus sits at the midsection with no structure. Steer clear of horizontal stripes across the torso. And resist overly tight, compression-style swimwear that creates a "sausage" effect — gentle smoothing is the goal, not constriction. Your slim legs are an asset, so choose styles that show them off.

Best Swimsuit for Athletic / Rectangle Body

Athletic or rectangle body types have a relatively straight silhouette — bust, waist, and hips are close in measurement, without dramatic curves. This is the most common female body type, and the good news is that it is also the most versatile for swimwear. Your goal is to create the illusion of curves and definition where the body has a straighter line.

Styles That Work

• Triangle bikini tops: Triangle tops create the appearance of a fuller bust and add shape to a straighter chest. The diagonal lines of the triangle cut introduce curves where a sportier build has none. Padding or lightly lined cups add volume without looking unnatural.
• Ruffle and frill details: Ruffles on tops, bottoms, or both add volume and dimension to a straight silhouette. A ruffle-edged bandeau or a bottom with frill side ties creates visual width at the bust and hips, which in turn makes the waist appear narrower by comparison.
• String ties and side ties: Tie details at the hips create the visual effect of wider hips. The strings sit outward from the body, extending the perceived width of the hip area and creating a more hourglass-like proportion. It is a simple trick that makes a real difference.
• Cut-out one-pieces: A one-piece with cut-outs at the waist creates the illusion of a defined waist on a straight frame. The exposed skin at the sides mimics the shadow and contour that curves naturally create, making this one of the most effective styles for athletic body types.
• Bold prints and patterns: All-over prints add visual interest and dimension to a frame that might look overly minimalist in a plain, solid swimsuit. Tropical prints, geometric patterns, and abstract designs all work well.

What to Avoid

Sports-style one-pieces with racerback straps emphasise the athletic build rather than softening it — fine for actual swimming, but less flattering for the beach. Avoid boyleg or boyshort bottoms that create a straight line across the thigh. And skip minimalist, structural designs with sharp angles — they accentuate straightness rather than creating curves.

Best Swimsuit for Inverted Triangle

Inverted triangle body types have broader shoulders and a wider bust compared to the hips. This shape is common among swimmers, athletes, and anyone who naturally builds muscle in the upper body. The styling strategy is the reverse of pear shape — minimise the upper body and add volume to the lower half to create visual balance.

Styles That Work

• Scoop neck and round neckline tops: Unlike V-necks that draw the eye outward to the shoulders, a scoop or round neckline keeps attention centred and softens the width of broader shoulders. Simple, unfussy tops work better than anything with embellishments or volume at the neckline.
• Simple, dark or solid-colour tops: A plain black, navy, or deep-toned top minimises the upper body. Avoid bold prints, bright colours, or ruffles on top — all of these draw attention upward, exactly where you do not want it.
• Patterned or bright bottoms: This is where you add visual interest. A patterned, bright, or textured bottom draws the eye downward and creates the impression of wider hips, balancing out broader shoulders. Floral prints, bold stripes, or tropical patterns on the bottom half all work well.
• High-waisted bottoms: A wide waistband with visual interest — a belt detail, a contrasting colour, or a print — adds volume and structure to the lower half. High-waisted styles also cover more of the torso, which helps visually shorten a longer upper body that sometimes comes with this shape.
• Skirted bottoms: A swim skirt or a bikini bottom with a short skirt overlay adds width and volume below the waist, creating the most dramatic balancing effect for inverted triangle shapes.

What to Avoid

Avoid anything that broadens the shoulders further: halter necks, wide straps, bandeau tops, and off-shoulder styles. Skip heavily padded or push-up bikini tops — they add volume where you already have it. And avoid very skimpy bottoms like string bikinis, which minimise the lower half when you actually want to add visual weight there.

The KOH SWIM Virtual Try-On Advantage

Everything in this guide gives you a starting point — a framework for understanding which styles tend to work best for each body type. But "tend to" is the problem. Every body is unique. Your hourglass shape might have slightly broader shoulders. Your pear shape might have a longer torso than average. The framework gets you 80% of the way there. Our virtual try-on gets you the remaining 20%.

According to the Google Shopping blog, virtual try-on images receive 60% more high-quality views than standard product photos. That number reflects what we see in practice: when customers can see themselves in a piece, they buy with confidence rather than hope. And confidence eliminates returns.

Source: Google Shopping Blog, "AI-Powered Virtual Try-On for Apparel," 2023

How It Works

1. Upload your photo: Take a full-body photo in form-fitting clothing or a swimsuit you already own. Any well-lit photo with a clear view of your body shape works.
2. Choose a piece: Browse our collection and select any KOH SWIM product — bikini sets, one-pieces, cover-ups, or individual tops and bottoms.
3. See yourself in it: Our AI generates a realistic preview of that piece on your body in about 30 seconds. You can see how the cut falls, how the colour works with your skin tone, and whether the proportions suit your shape.
4. Compare styles: Try multiple pieces and compare them side by side. This is where the body-type guidance in this article becomes actionable — try the styles we recommend for your shape and see for yourself whether they work.

Since launching virtual try-on, our return rate has dropped to less than half the industry average cited by Fit Analytics. When you can actually see a swimsuit on your body before buying, the guesswork disappears. We have processed over 10,000 try-on sessions, and the pattern is clear: customers who use the tool buy more confidently and keep what they buy.

Quick Reference: Body Type vs. Recommended Styles

Here is everything in one table. Find your body type on the left, then scan across for the swimwear styles that will flatter your shape most.

Frequently Asked Questions

Which swimsuit style is best for each body type?

Hourglass shapes suit high-waisted bikinis and belted one-pieces that highlight the waist. Pear shapes look best in bandeau or halter tops with high-cut bottoms to elongate the legs. Apple shapes benefit from ruched one-pieces and tankinis with structured high-waisted bottoms. Athletic/rectangle frames are flattered by triangle bikinis and ruffle details that create curves. Inverted triangle shapes balance proportions with scoop-neck tops and patterned high-waisted bottoms. See each section above for detailed recommendations and specific KOH SWIM product picks.

How do I determine my body type for swimwear?

Measure three points with a flexible tape measure: bust (fullest part of chest), waist (narrowest point above navel), and hips (widest point around buttocks). Hourglass: bust and hips roughly equal, waist is 8–12 inches smaller. Pear: hips are 5%+ wider than bust. Apple: waist is the widest measurement, or within 2 inches of bust and hips. Athletic/Rectangle: all three within 5% of each other. Inverted Triangle: bust is 5%+ wider than hips. Most people are a blend of two types — focus on which description fits best and use our virtual try-on to verify.

What is virtual try-on for swimwear and how does it work?

Virtual try-on uses AI to show you wearing a specific swimsuit on your own body shape. At KOH SWIM, you upload a full-body photo and our AI generates a realistic preview of each piece from our collection on your figure. It takes about 30 seconds per image. This lets you see how a style, cut, and colour works with your body type before purchasing — eliminating guesswork and reducing returns. It is free, requires no sign-up, and works on any device at kohswim.com/try-on-b.

Is a bikini or one-piece more flattering for my body?

Both can be equally flattering when chosen correctly. Bikinis offer mix-and-match flexibility — you can pair a larger top with a smaller bottom, or choose different styles for each half to balance proportions. One-pieces excel at creating a smooth, elongated silhouette, especially with ruching, cut-outs, or belted waists that define shape. For apple body types, one-pieces with strategic ruching are often more comfortable and flattering. For hourglass and pear shapes, high-waisted bikinis are universally flattering. Athletic shapes can go either way.

How should swimwear fit for the most flattering look?

Proper fit matters more than style. Bikini tops should lie flat against your chest without gaping or cutting in — if you see bulging at the sides, size up. Bottoms should sit without digging into skin or leaving red marks. Straps should stay in place without constant adjustment. One-pieces should allow full range of movement without pulling at the crotch when you raise your arms. When in doubt, size up. A slightly loose swimsuit looks more flattering than one that is too tight. Check our size guide for specific measurements.

What swimwear is best for curvy figures?

Curvy figures — typically hourglass or pear shapes with a D-cup or above — look fantastic in swimwear designed with support. Look for underwire bikini tops or high-neck styles with built-in shelf bras for bust support. High-waisted bottoms with wide waistbands smooth and support without compressing. Wrap-style one-pieces and belted designs cinch at the waist to highlight curves. Avoid flimsy triangle tops that will not provide support, and opt for thicker straps or halter necks over spaghetti straps. Our Kata Set is designed with exactly these features.

What swimwear is best for petite or small-chested frames?

Petite frames and smaller busts have the most freedom in swimwear. Triangle bikini tops, bandeau styles, and bralette cuts all work well without needing heavy support. Ruffles, frills, and padded tops add volume for those who want it. High-cut leg openings elongate shorter legs. Avoid oversized bottoms or very wide-band styles that can overwhelm a petite frame. String bikinis and delicate ties create proportion. For petite figures specifically, choose smaller prints — large patterns can overpower a smaller frame. Browse our full range at shop.kohswim.com.

What are the best swimsuit colours for each body type?

Colour can enhance or balance proportions. Dark colours (black, navy, deep green) have a slimming effect and work well on areas you want to minimise. Bright colours and bold prints draw attention and work best on areas you want to highlight. For pear shapes, pair a bright or patterned top with dark bottoms. For inverted triangles, reverse that — simple dark top, bold patterned bottoms. Hourglass figures can wear solid colours or all-over prints confidently. For apple shapes, vertical patterns or colour-blocked designs with darker centres create a lengthening effect. Universally, jewel tones (emerald, sapphire, coral) are the most flattering across all skin tones and body types.

Written by The KOH SWIM Team

Phuket-Based Swimwear Brand · Est. 2025

We design swimwear in Phuket, Thailand, and fit hundreds of customers every month across every body type. This guide was written from direct experience helping women and men find swimwear that flatters their unique shape — informed by thousands of virtual try-on sessions and real customer feedback.

Last updated: March 20, 2026