3 measurements are needed for
working out your correct bra size – overbust and underbust size, and cup size.
If you look at bra size labels,
they usually have a mark like “36C” or “34DD”. The number relates to the bust
size, in inches, and the capital letter is the cup size. Bras always come in
even bust (band) sizes like 30, 32, 34, 36 etc,