How to Choose the Right DIM Bra Size for Everyday Comfort

Quick answer

Measure your underbust snugly and your full bust at the fullest point, then subtract the underbust from the bust to find your cup. Choose a DIM style that matches your support needs: wireless for light, natural support and wired for more shaping. When you are between two band sizes, size up in the band and down in the cup.

A bra only feels comfortable when the band, cup and straps work together. If the band rides up, the straps dig in or the cups gap, the size is usually the first thing to check, not the style.

This guide walks through measuring at home, reading the DIM size chart and matching the bra to how you actually wear it. You will also see how two very different DIM bras solve different fit problems, so you can choose with confidence instead of guessing.

Measure your band and cup at home

Wear an unpadded bra or no bra at all. Wrap a soft tape measure around your ribcage, directly under your bust, keeping it level and snug but not tight. Round to the nearest whole number. This is your band measurement, and it is the number you will match to the DIM size chart first.

Next, measure around the fullest part of your bust, usually across the nipple line, keeping the tape parallel to the floor. Subtract your band measurement from your bust measurement. The difference gives your cup: roughly 1 inch per cup letter, so a 1-inch difference is an A, 2 inches is a B, 3 inches is a C, and so on. If the difference falls between two cups, try the larger cup first.

• Measure at the end of the day, when your body is at its natural size.
• Keep the tape level all the way around; a tilted tape skews both numbers.
• Write both numbers down before you open the size chart.

Read the DIM size chart with your measurements

DIM bras use standard European sizing, so your band measurement in centimetres usually maps directly to the size label. If your underbust is 82 cm, start with a 85 band. If your bust measurement is 96 cm, the 14 cm difference points to a C cup, so your starting size is 85C. Always check the specific product page, because the fit can vary slightly between styles.

Fit is not only about numbers. The band should feel firm but not restrictive, and you should be able to slide two fingers under it at the back. The centre front of the bra should sit flat against your sternum. If it lifts away, the cup is probably too small; if the fabric wrinkles, the cup is probably too large.

• If you are between band sizes, choose the larger band and the smaller cup.
• Fasten on the loosest hook when trying a new bra; the tighter hooks are for later.
• Cup spillage at the top or sides means you need a larger cup, not a larger band.

Match the bra style to your support needs

Wireless bras like the Brassière femme Gris Chiné Dim Icons give natural support and a free feeling, which suits smaller to medium busts and days when you want light comfort. The cotton modal fabric stretches with you, and the absence of a shell and underwire means nothing presses into the ribs. The swimmer back frees the shoulders and stays put under a t-shirt.

Wired bras like the Soutien-gorge à armatures ivoire Dim x Ines de la Fressange are built for more shaping and balanced support. The micro satin and transparent mesh voile give a smooth finish, and the U-shaped back distributes tension across the back rather than the shoulders. This style is a better match for larger busts or anyone who wants a defined neckline under a fitted top.

• Choose wireless for lounging, travel and light support days.
• Choose wired for shaping, lift and long days on your feet.
• A bra that fits well should not leave red marks or need constant adjusting.

Check the fit before you commit

Once you have your starting size, try the bra on with the band on the loosest hook and the straps adjusted to sit flat on your shoulders. Raise your arms, twist your torso and bend forward. The band should stay in place and the cups should follow your movement without gaping or digging. If the band rides up at the back, go down a band size and up a cup size.

Give a new bra a full day of wear before deciding. A bra that feels slightly firm in the morning often settles into the right fit within an hour. If it still feels tight after a day, or if the cups crease when you move, exchange it for the next size. DIM product pages list the available sizes for each style, so you can check before ordering.

• Do the two-finger test under the band at the back.
• Check that the underwire sits flat against your ribcage, not on breast tissue.
• Wash your bra by hand or in a mesh bag to keep the band elastic working longer.

Decision rules for your DIM bra size

• Band rides up at the back: The band is too large. Go down one band size and up one cup size to keep the same cup volume. Re-check the two-finger test after adjusting.
• Cups gap or wrinkle: The cup is too large or the style is too shallow for your shape. Try one cup smaller or switch to a wireless style that stretches with you. If the gap remains, the band may be too loose rather than the cup too big.
• Spillage at the top or sides: The cup is too small. Go up one cup size before changing the band. A larger cup often fixes the problem without changing the band.
• Straps dig into your shoulders: The band is not carrying enough weight. Tighten the band or choose a style with a U-shaped back for better distribution. Straps should sit flat, not bear the full weight of the bust.
• You want natural shape and light support: Choose a wireless bra with stretch fabric and no shell, like the Dim Icons brassière. Best for smaller to medium busts and relaxed days.
• You want shaping and balanced support: Choose a wired bra with a structured back, like the Dim x Ines de la Fressange soutien-gorge. Best for larger busts or fitted outfits.

DIM styles that solve different fit needs

• Brassière femme Gris Chiné Dim Icons: Cotton modal stretch fabric, swimmer back, no shell and no underwire, elasticated signature basque. The stretch fabric and wireless design give natural support without pressure, and the swimmer back keeps straps off the shoulders, which helps if you dislike digging straps.
• Soutien-gorge à armatures ivoire Dim x Ines de la Fressange: Micro satin and transparent mesh voile, underwired structure with U-shaped back, support adapted to generous busts. The underwire and U-back give more balanced support and shaping, which is useful if you need lift or want a defined neckline under fitted clothing.

Which DIM bra is right for you?

Best for

• Everyday wear when you want light, natural support without underwire
• Smaller to medium busts or anyone who dislikes pressure on the ribs
• Shoulders that need freedom of movement, thanks to the swimmer back

Not for

• Anyone who needs strong lift or shaping under a fitted top
• Larger busts that feel more comfortable with an underwired structure

Start with your measurements, use the DIM size chart as a guide, and let the style match your support needs. A wireless bra gives easy comfort, while a wired bra adds shaping and structure. Try your starting size on the loosest hook, adjust from there, and you will find a fit that stays comfortable all day.