Measure completely around the bust at the fullest point.
Each inch of difference between this measurement and your BAND size = cup size. (i.e.: If your band size is 34" and your bust measurement is 35", you wear an "A" cup.)
Measure around your ribcage, directly under the bust.
Add 5 to this measurement to obtain your band size. (i.e.: If your ribcage measurement is 29" + (5) = 34" band size.)
If the difference is less than: 1 inch = AA cup 1 inch = A cup 2 inches = B cup 3 inches = C cup 4 inches = D cup 5 inches = DD cup
