The bra size is usually the number of inches around the rib cage where the bra sits, so you would simply have to convert 32 inches to centimeters, which is 81.28 centimeters.
The different numbers before "A" in a bra size are the size of the band. A bra size 32A will fit a woman who is about 32 inches around the rib cage.
A cup size is measured according to the band size. Each letter represents an inch more than the band. For instance, if a bra is a 32B, it means the measurement around the rib cage is 32" and the measurement including rib cage and the swell of the breasts is 34". So, if the cup is a D, it means the swell of the breasts are 4" more than the rib cage. If the bra is a 36D, the rib cage would be 36", and the rib cage and breasts would be 40". For a smaller framed woman, the average in the United States is a 34B. For a woman with a larger frame, the average is a 34DD. Keep in mind, these are just the averages. There is quite a variety of larger and smaller sizes.
The number is actually the distance around your rib cage under your breast. The best way to reduce the number is through diet and exercise to reduce fat. Your ribs aren't going to be shrinking.
Karen Gillans bra size is 32 B.
32b bra size is bigger than size 32a
w
32 a
The average woman's bra size is a 34C.
size 32 c
32 c
32 D