AA, A, B, C, D, E and F refer to the cup size, and the bust minus the lower bust is the cup size. If the difference between your bust and your lower bust is 10cm, then you should apply a mask (see the table below).

The difference between cup size and lower bust.

AA 7.5cm

One piece 10cm

B12.5cm

C 15cm

D17.5cm

20 cm long

22.5 cm

For example, your bust should be 92cm and your lower bust should be 80cm. Subtract the two numbers to get 12cm. Then use a B cup, and the bra you want to wear is 80B.

F is the largest and A is the smallest.