How to Measure Yourself for a Swim Thong That Fits

Quick answer

Measure your natural waist at the narrowest point and your hips at the fullest point, using a soft tape held snug but not tight. Compare those numbers to the brand's size chart and choose the size that matches your hip measurement first, because a swim thong's fit depends more on hip circumference than waist. If you are between sizes, size up for comfort.

A swim thong that fits well stays in place when you swim, walk, or sit, and it feels comfortable against your skin. The difference between a great fit and a constant adjustment usually comes down to two measurements: your waist and your hips. Getting them right takes two minutes and a soft tape measure.

This guide walks you through measuring yourself at home, reading a swimwear size chart, and checking the fit once your thong arrives. It also covers what to do when you fall between sizes and how to care for the fabric so it keeps its shape.

Measure your natural waist

Stand relaxed and find the narrowest part of your torso, usually just above your belly button. Wrap a soft tape measure around that point, keeping it level all the way around. Breathe normally and note the number where the tape meets. Do not pull the tape tight or let it sag.

A common mistake is measuring over bulky clothing or holding your breath. Wear only underwear or nothing at all, and let the tape rest lightly against your skin. If you get a number that ends in a half-inch, round up to the next whole inch for swimwear.

• Checkpoint: the tape should sit level and feel snug, not restrictive.

Measure your hips at the fullest point

Your hip measurement is the most important number for a swim thong because the cut sits low and relies on the hip band to stay put. Wrap the tape around the fullest part of your hips and buttocks, usually about 7 to 9 inches below your natural waist. Keep the tape parallel to the floor.

Stand with your feet together and the tape flat against your body. If you have trouble keeping the tape level, measure in front of a mirror or ask someone to help. Write down both numbers before you look at any size chart.

• Checkpoint: the tape should not dig in or leave a mark; if it does, loosen it slightly.

Read the brand's size chart carefully

Every brand builds its swimwear on a different block, so always use the size chart for the specific product you are buying. Compare your hip measurement to the chart first, then check your waist against the same row. If your waist and hips point to different sizes, follow the hip measurement for a swim thong.

For example, the TEAMM8 Standard Swim Brief - Navy has a low-rise cut with a 2 1/4 inch side at the hip and an internal self-coloured tie-cord with silicone tip. That cord lets you adjust the waist slightly, but the hip band still needs to match your hip measurement for a secure fit.

• Checkpoint: if you are between sizes, choose the larger size for comfort and coverage.

Check the fit when it arrives

Try your swim thong on over clean underwear first, then without if you want a true feel. The waistband should sit flat without rolling, and the pouch should hold you comfortably without gaping. Move around, squat, and bend to see if the back stays in place or rides up.

If the thong digs into your hips or leaves red marks, it is too small. If the waistband gaps or the pouch feels loose, it is too big. A well-fitting swim thong feels secure but not tight, and it should not need constant adjusting.

• Checkpoint: keep the tags on until you have tried it on, in case you need to exchange.

Care for the fit

Rinse your swim thong in cool fresh water after every wear to remove chlorine, salt, and sunscreen. Hand wash with a mild detergent and lay flat to dry away from direct sun. Avoid wringing or tumble drying, which can stretch the fabric and break down the elastic.

Proper care keeps the waistband and hip band elastic working as intended, so the fit you dialed in on day one lasts through the season. Store your swimwear flat or rolled, not stretched on a hanger.

• Checkpoint: never leave a wet swim thong balled up in a bag; rinse and dry it promptly.

Choosing a style that suits your measurements

Different swim thong styles sit at different heights and offer different coverage. A high hip cut, like the TEAMM8 Arena Swim Thong - Aegean, exposes more skin at the hip and relies on a precise hip measurement. A classic brief cut, like the TEAMM8 Standard Swim Brief - Navy, offers more coverage and a slightly more forgiving fit.

If you are new to swim thongs, start with a style that has an internal tie-cord, such as the Ultra Sports Swim Brief - Army. The cord lets you fine-tune the waist, while the lined pouch and cut-out sides give a bold look. Once you know your hip measurement, you can confidently choose any cut.

• Checkpoint: match the cut to your comfort level and the coverage you want.

Your step-by-step measuring routine

1. Gather your tools: Use a soft tape measure, or a piece of string and a ruler. Wear only underwear or nothing at all. Stand in front of a mirror if possible. Checkpoint: a flexible tape gives the most accurate reading.
2. Measure your natural waist: Find the narrowest part of your torso, usually just above the belly button. Wrap the tape around, keep it level, and breathe normally. Note the number. Common mistake: pulling the tape too tight or measuring over clothing.
3. Measure your hips at the fullest point: Wrap the tape around the fullest part of your hips and buttocks, about 7 to 9 inches below your waist. Keep the tape parallel to the floor and snug. Checkpoint: this is the key measurement for a swim thong.
4. Compare to the size chart: Use the specific size chart for the product you want. Match your hip measurement first, then check your waist. If you are between sizes, size up. Common mistake: using a generic size chart instead of the brand's.
5. Try it on and move: When your swim thong arrives, try it on and squat, bend, and walk. The waistband should stay flat and the back should not ride up. Keep tags on until you are sure. Checkpoint: if it digs in or gaps, exchange for a different size.

Product facts that affect fit

• TEAMM8 Arena Swim Thong - Aegean: High hip cut thong, fully lined, 3/4 inch at hip, double lined. The narrow 3/4 inch hip band means your hip measurement must be accurate; a size too small will dig in, while a size too large may slip.
• TEAMM8 Standard Swim Brief - Navy: Low-rise, 2 1/4 inches at hip, internal self-coloured tie-cord with silicone tip, double lined. The wider hip band and adjustable tie-cord give a more forgiving fit, making this a good choice if you are between sizes or new to swim briefs.
• Ultra Sports Swim Brief - Army: Cut-out sides, quick-dry 4-way stretch, internal tie-cord with silicone tips, lined pouch. The 4-way stretch fabric moves with you, and the tie-cord lets you adjust the waist for a secure feel during activity.

Accurate measurements take the guesswork out of buying a swim thong online. Measure your waist and hips, follow the brand's size chart, and choose a cut that matches your comfort level. With the right fit, you will forget you are wearing anything at all.