How to Measure for a Perfect Underwired Bra

Quick answer

To measure for an underwired bra, you need two measurements: your band size (underbust) and your cup size (bust). Wrap a measuring tape snugly around your ribcage just under your bust for the band, then measure around the fullest part of your bust for the cup. The difference between the two determines your cup letter, and the band number is your underbust measurement rounded to the nearest even number.

Step-by-step underwired bra measuring guide

1. Measure your band size: Wrap a soft measuring tape around your ribcage, directly under your bust. Keep it snug but not tight, and make sure it's level all the way around. Exhale normally and take the measurement in inches. If you get an odd number, round up to the next even number. This is your band size. Common mistake: measuring over clothing or pulling the tape too loose.
2. Measure your bust for cup size: Wrap the tape around the fullest part of your bust, keeping it parallel to the floor. Don't pull tight—let the tape rest gently against your skin. Measure in inches and note the number. Keep your arms down and avoid wearing a padded bra for this measurement. Common mistake: measuring while leaning forward, which adds extra inches.
3. Calculate your cup size: Subtract your band measurement from your bust measurement. The difference in inches corresponds to your cup letter: 1 inch = A, 2 inches = B, 3 inches = C, 4 inches = D, and so on. For example, a 36-inch band and a 38-inch bust gives a B cup. Common mistake: relying on the cup letter alone without checking the band fit.
4. Check the fit on your body: Try on the underwired bra and do the 'two-finger test': you should be able to slide two fingers under the band. The center gore (the part between the cups) should lie flat against your sternum, and the underwire should encircle your breast without digging in. If the band rides up at the back, it's too loose. If the wire lifts off your chest, the cup is too small. Common mistake: judging fit only by the front view.

Underwired bras that reward accurate measuring

• High-Cut Underwired Two-Piece Swimsuit Lined Cups: Pelie's Underwired Two-Piece Swimsuit features lined cups, a high-cut bottom, and adjustable details for a premium, flattering fit. Once you know your band and cup size, you can confidently choose this swimsuit knowing the lined cups and adjustable details will support you comfortably, whether you're lounging or swimming.
• Lingerie Set with Skirt Underwired Push-Up Bra: Pelie's Lingerie Set with Skirt features an underwired push-up bra, adjustable straps, and a soft, comfortable fabric with a chic skirt addition. For everyday wear, this set's adjustable straps let you fine-tune the fit after measuring, while the underwired push-up bra gives the lift you expect from a correctly sized underwired style.