Step 1 - Bra size:
Measure around the body directly under the bust while wearing a bra. If the measurement is an odd number add 5", if an even number add 4"... e.g. 35" + 5" = 40", 36" + 4" = 40". This is now your bra size.

Step 2 - Cup size:
For the cup size, measure the fullest part of the bust, subtract your bra size from your cup measurement. If there is no difference you require an A cup. Consult the cup size chart below.