The 32 band size is shared by both of these meaning both are designed for a snug 28–29 inch underbust measurement. The cup is where they part ways: a B cup is a roughly 2-inch bust-to-band difference, while a C cup is about 3 inches.
Why smaller bands often need bigger-sounding cups
On a smaller band like 32, even a modest bust size can register as a C or D cup, because the cup letter is relative to a tighter starting point. This surprises a lot of people who assume a small band always means a small cup.
How to tell which fits
- Gaping or loose fabric at the top of a 32C cup → try the 32B
- Spillage, bulging, or visible seam strain in a 32B → try the 32C
- If the band rides up regardless of cup, the band not the cup needs adjusting
Confirm your exact size with our Bra Size by Measurement Calculator, and check your closest alternative sizes with our Sister Size Calculator.