Sizing & Fit

A bra size is two pieces of information squeezed into one label: a band number for the ribcage and a cup letter that only means something next to that band. This section explains both, and why the same size can fit differently from one maker or country to the next.

Start with how to measure bra size for the two measurements and the simple math behind them. The bra size chart guide then shows how band numbers and cup letters line up across US, UK and EU labels.

If a bra almost fits, bra sister sizes explains how to trade band for cup without changing cup volume, and signs your bra does not fit goes through the band, cups, straps and center gore. A measurement is a starting point; the fit check is what settles it.