Your underbust measurement is your band size (if it's even, if it's odd you add 1 inch), and the cup size is the difference between this and your bust measurement. A=1 inch, B=2 inches, C=3 inches, D=4 inches, etc. So if you had an underbust of 28 inches and a bust of 33 inches, you'd be a 28DD.
Well first you don't really have to measure just find one at the store that fits but here's how....
Measure your chest (not your boobs) and that is the first size
Example: 32 33 34
Then measure your boobs around your chest all the way around then once you have that number subtract both the numbers by each other and that's your other size if you get this
AAA= 0inch difference
A= 1 inch difference
B= 2 inch difference
C= 3 inch difference
And so on so that's the letter and you put it with the number
Comments
Your underbust measurement is your band size (if it's even, if it's odd you add 1 inch), and the cup size is the difference between this and your bust measurement. A=1 inch, B=2 inches, C=3 inches, D=4 inches, etc. So if you had an underbust of 28 inches and a bust of 33 inches, you'd be a 28DD.
Well first you don't really have to measure just find one at the store that fits but here's how....
Measure your chest (not your boobs) and that is the first size
Example: 32 33 34
Then measure your boobs around your chest all the way around then once you have that number subtract both the numbers by each other and that's your other size if you get this
AAA= 0inch difference
A= 1 inch difference
B= 2 inch difference
C= 3 inch difference
And so on so that's the letter and you put it with the number
Example- 32B