Working out your cup sizing:
Measure your under bust, Measure your full bust, Subtract Overbust from Fullbust. Difference in inches is your cup size
1inch = A
2 inch = B
3inch = C
4inch = D
5inch = DD
6 inch = E
7inch= F
8 inch =G
9 inch= H
10inch = I
11inch = J
12+inches = K+