"This bra comes in a petite version for AA, A and B cups with slightly thicker padding in the cups. See the Fashion Forms Nubra Ultralite Petite Padded Bra 16847
The cup sizing is based on a 34 band size. So, consider going up or down a cup size based on your band size. For example, if you're a 36B, you may want to consider the C cup. If you're a 32C, you may want to consider a B cup."