Bikini Bottoms Fit Guide: High Waist, Brazilian and Classic Cuts

Quick answer

Choose high waist briefs if you want smooth coverage over your lower belly and hips. Choose Brazilian briefs if you want a lifted, cheeky look with lace or print details. Choose a classic 5 cm side bikini bottom for reliable hip and groin coverage with a mid-rise fit. Always check the side width and back coverage before you buy, because those two numbers decide how the bottom actually feels and looks on your body.

Bikini bottoms are not one shape. A high waist brief, a Brazilian cut, and a classic 5 cm side bottom can all fit the same size label but feel completely different on. The difference comes down to three measurements: rise (how high the waist sits), side width (how much fabric runs over your hip), and back coverage (how much of your buttocks is covered).

This guide explains those three numbers so you can choose a bikini bottom style without guessing. You will see how specific Marlies Dekkers styles map to real coverage needs, from full lower-belly coverage to a cheeky Brazilian cut, and get decision rules you can use before you add anything to your cart.

The three measurements that decide bikini bottom fit

Rise is where the waistband sits on your torso. A high waist brief sits at or above your belly button, a mid-rise sits near your hip bones, and a low-rise sits below them. Side width is the measurement of the fabric at the side seam; 5 cm is a classic, moderate width, while wider sides give more hip coverage and narrower sides give a skimpier look. Back coverage is how much of your buttocks the fabric covers, from full coverage to a Brazilian cut that leaves the lower half exposed.

These three measurements interact. A high rise with wide sides and full back coverage creates an hourglass shape and smooths the lower belly. A low rise with narrow sides and minimal back coverage creates a cheeky, seductive look but offers less hold. When you shop, read the product description for these numbers instead of relying on the size label alone.

• Check the side width in centimeters if it is listed; 5 cm is a reliable moderate coverage starting point.
• Look for words like 'high waist' or 'Brazilian' in the product name; they signal the rise and back coverage before you open the page.

High waist vs Brazilian bikini bottoms: coverage and trade-offs

High waist briefs cover your lower belly, hips, and buttocks. The higher rise creates a smooth line under beachwear and can feel more secure if you are active or self-conscious about your midsection. The trade-off is less ventilation and a more covered look, so they work best for pool days, family beaches, or when you want a retro silhouette.

Brazilian briefs cover your groin and the upper part of your buttocks but leave the lower half exposed. That cut lifts and highlights your bum and feels lighter than a full-coverage brief. The trade-off is less back coverage and more skin on show, so they suit confident beach days, romantic holidays, or layering under a sarong. If you want a middle ground, look for a Brazilian cut with lace or a print that adds visual interest without adding fabric.

• Choose high waist if you want lower-belly coverage and a smoothing effect.
• Choose Brazilian if you want a lifted, cheeky look and do not mind exposed lower buttocks.

Classic and adjustable cuts: the everyday middle ground

Classic bikini bottoms with a 5 cm side sit between high waist and Brazilian in coverage. They cover your hips, groin, and buttocks comfortably, and the mid-rise waistband stays put during swimming and walking. This is the easiest style to wear if you are unsure what you want, because it flatters most body types without demanding a specific body shape.

Adjustable side ties add another layer of control. A tie-and-bow bikini bottom lets you tighten or loosen the sides to change the rise and hip fit, which helps if you are between sizes or want a more custom feel. The trade-off is that ties can come undone in rough surf, so double-knot them before you swim.

• Start with a 5 cm side classic cut if you are buying your first bikini bottom in years.
• Choose adjustable side ties if your hip measurement sits between two sizes.

How to match bikini bottom coverage to your plans

Your beach or pool activity should guide coverage. If you plan to swim laps, play beach volleyball, or chase children, choose a high waist or classic 5 cm bottom that stays in place. If you plan to sunbathe, read, or take photos, a Brazilian cut or a tie-side bottom gives you a lighter tan line and a more playful look.

Think about what you will wear over the bottom, too. High waist briefs sit smoothly under a pareo or wrap dress. Brazilian and tie-side bottoms can create bumps under tight cover-ups, so pair them with looser fabrics or wear them as the main event. Finally, consider your swim top: a high waist bottom balances a push up bikini top, while a Brazilian bottom pairs well with a simple triangle or bandeau top.

• Active beach day: high waist or classic 5 cm side.
• Sunbathing or photos: Brazilian or adjustable tie-side.
• Layering under clothes: high waist for the smoothest line.

Decision rules for choosing your bikini bottom

• If you want lower-belly coverage and a smoothing line: Choose a high waist brief with full back coverage. It covers your lower belly, hips, and buttocks and creates an hourglass shape. Best for active beach days, family pools, and wearing under cover-ups.
• If you want a lifted, cheeky look with less fabric: Choose a Brazilian brief. It covers the hip and groin but leaves the lower half of your buttocks exposed, which lifts and highlights your bum. Best for sunbathing, romantic holidays, and confident beach photos.
• If you want a reliable middle ground: Choose a classic cut with 5 cm sides. It covers hips, groin, and buttocks comfortably and suits most body types without a specific rise. Best for first-time buyers or anyone unsure between high waist and Brazilian.
• If you are between sizes or want adjustable fit: Choose a tie-side bikini bottom. The side ties let you tighten or loosen the fit and change the rise to suit your hip shape. Double-knot the ties before swimming to prevent them coming undone.

Marlies Dekkers bikini bottoms that show these fits in practice

• high waist briefs: These high waist briefs celebrate and accentuate your curves, creating a beautiful hourglass figure. Made from glossy orange fabric and adorned with luscious, lurex-accented flower lace, these briefs feature delicate lace trim that adds a touch of refined elegance. The fabric provides comfortable coverage for your lower belly, hips, and buttocks, ensuring a smooth and flattering fit. Playful ruffles along the edges. This is the fullest-coverage option in the guide: it covers lower belly, hips, and buttocks, so it suits anyone who wants a smoothing, secure fit for active beach days or under cover-ups.
• 5 cm bikini bottom: With sides measuring 5 cm, these bikini bottoms offer comfortable coverage for your hips, groin, and buttocks, providing a flattering fit that suits all body types. Crafted from smooth recycled polyamide, the feminine floral pattern is printed digitally to save water and energy, making these briefs an eco-friendly choice for your summer wardrobe. This delightful design is guaranteed to add a touch of bohemian chic. The 5 cm side width is the classic middle ground: more hip coverage than a Brazilian, less rise than a high waist, and a digital print that uses less water. Choose this if you want reliable everyday coverage with a lighter feel.
• 8 cm brazilian briefs: Unleash your inner goddess with these seductive black brazilian briefs. Most of the hip and groin are beautifully covered with delicate, slightly transparent lace, while your belly and the lower part of your buttocks are left enticingly exposed. Intricately designed with playful straps, provocative cut-outs, and a luxurious combination of black recycled lace and nude-colored lining. This is the cheekiest cut here: it covers the hip and groin but leaves the lower buttocks and belly exposed. Pick it for confident, romantic beach days when you want a lifted look and do not need lower-belly coverage.

Who each bikini bottom cut is for

Best for

• Anyone who wants lower-belly coverage and a smooth silhouette under cover-ups
• Active beachgoers who swim, play sports, or chase children and need a secure fit
• Shoppers who prefer a retro, hourglass look with lace or ruffle details

Not for

• Anyone who wants maximum skin exposure and a minimal tan line
• Swimmers who prefer a low-rise, barely-there feel in the water
• People who find high waistbands uncomfortable in heat or humidity

Use the three measurements—rise, side width, and back coverage—to choose your bikini bottom instead of guessing from a size label. High waist briefs give you full lower-belly and hip coverage, Brazilian briefs give you a lifted cheeky look, and a classic 5 cm side sits comfortably in between. Pick the cut that matches your beach plans and how much coverage you actually want to wear.