Quick answer

To measure for a wirefree bralette, you need two numbers: your band measurement (underbust) and your bust measurement (over the fullest part). Subtract the band from the bust to find your cup size. Use a soft tape measure, keep it snug but not tight, and always measure while wearing a non-padded bra for the most accurate fit.

What You'll Need

Before you start, grab a soft measuring tape (the kind used for sewing), a mirror, and a non-padded bra or a fitted top. Wear something that doesn't compress your bust so the tape sits against your natural shape. If you don't have a measuring tape, use a piece of string and a ruler, but a tape is far easier.

Why Wirefree Bralette Sizing Differs

Wirefree bralettes rely on stretch fabric and band tension rather than a rigid underwire for support. That means a slightly looser band measurement is often more comfortable, and cup fit depends more on the bralette's fabric and cut than a strict cup letter. Brands like Nala design their bralettes with specific sizing charts, so always check the brand's guide after you take your measurements.

Step-by-Step Measuring Guide

  1. Measure your band (underbust): Wrap the tape snugly around your ribcage, directly under your bust. Keep the tape parallel to the floor and take a deep breath out. Note the measurement in inches. If it's an odd number, round up to the next even number—this is your band size. Common mistake: pulling the tape too tight. The band should feel firm but not dig in.
  2. Measure your bust (fullest part): Stand up straight with your arms at your sides. Wrap the tape around the fullest part of your bust, usually at nipple level. Keep the tape parallel and snug but not compressing. Write down this number. Checkpoint: make sure the tape doesn't dip at the back or slide down.
  3. Calculate your cup size: Subtract your band measurement from your bust measurement. Each inch difference equals one cup size: 1 inch = A, 2 inches = B, 3 inches = C, and so on. For example, a 36-inch band and 39-inch bust gives a 3-inch difference, which is a C cup. Remember: wirefree bralettes often run a cup size smaller than wired bras, so consider sizing up in the cup if you're between sizes.
  4. Check the brand's size chart: Every brand has its own fit quirks. Nala provides a specific size chart for each bralette style. Compare your band and cup calculation to their chart, and read customer reviews for fit notes—especially if you're between sizes or have a fuller bust. Final tip: when in doubt, order two sizes and return the one that doesn't fit. Many online stores, including Nala, offer free returns.

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