Balcony Bra Fit Guide: How to Choose the Right Size

By Marlies Dekkers Lingerie & Swimwear | Published: 2026-10-24

Category: How-to Guides

Learn how to measure and fit a balcony bra for the perfect support and shape. Avoid common sizing mistakes with our step-by-step guide.

Quick answer

To choose the right balcony bra size, start with an accurate band and bust measurement, then check the band levelness, wire position, and strap tension to avoid common fit issues.

Why balcony bra fit matters

A balcony bra creates a soft, rounded cleavage and a supportive lift. Unlike full-coverage bras, the cup height is lower, so the band and wire must work harder to hold the bust in place. An incorrect size can lead to slipping straps, gaping cups, or a band that rides up, all of which reduce the elegant silhouette the balcony style is designed for.

Cup shape and coverage differences

Balcony bras have a horizontal cut that exposes the upper chest, which means they are more sensitive to cup depth than full-cup styles. If the cup is too shallow, the bust will push the bra down; if too deep, the cup will pucker. The Marlies Dekkers Space Odyssey balcony bra uses glossy microfiber with a subtle deluster pattern, so the fabric itself adds structure—but only if the size is correct.

Step-by-step balcony bra fit guide

Measure your band size: Wrap a soft tape snugly around your ribcage, directly under your bust. Round to the nearest even number. This is your band size. If the tape feels loose, go down a band size. A too-loose band forces the straps to bear all the weight, causing slipping straps and poor support.
Measure your bust size: Measure around the fullest part of your bust, keeping the tape parallel to the floor. Subtract your band measurement from this number. Each inch equals one cup size (1 inch = A, 2 = B, 3 = C, etc.). If the difference is half an inch, size up to the next cup to avoid spillage over the low balcony cut.
Check the band level: Put on the bra and fasten on the loosest hook. The band should sit horizontally across your back, not riding up. If it rises, the band is too big. If it digs in, try a larger band and smaller cup. A level band provides 80% of the support, so this is the most critical fit checkpoint.
Assess the wire position: The underwire should lie flat against your sternum, not floating or poking the breast tissue. The wire should encircle the bust completely, without sitting on breast tissue at the sides. If the wire lifts away from the chest, the cup is too small or the band is too loose.
Adjust the straps: Tighten the straps so they stay on your shoulders without digging in. The balcony cut means the straps frame the décolleté, so they should not be overly tight to compensate for a loose band. Straps that need constant adjustment usually indicate a band size issue, not a strap problem.
Test the cup fit with movement: Raise your arms and bend forward slightly. If the cup gapes or the bust shifts, the cup size or shape may be wrong. The balcony bra should stay in place and maintain a rounded cleavage. A well-fitted balcony bra should not require readjustment during normal daily activities.

Product facts

balcony bra: The balcony bra from the Space Odyssey collection is crafted in glossy microfiber with a subtle deluster pattern inspired by ornate tea salons. The microfiber fabric provides a smooth, supportive fit that helps maintain the cup shape, but only when the band and cup size are correctly matched.
balcony bra