STEP #1 Finding the correct size.
Measure the rib cage snuggly, but comfortably just below the breasts. If the number is 33 or less, add 5 inches to that number and that is your bra size. Over 33 inches add 3 inches to get you bra size. Both ways, rounding odd numbers up to even.
Then measure the bust around the fullest part. Now subtract that last number from this new number and you'll come up with another number used to determine cup size.
AA = 1/2"
A = 1"
B = 2"
C = 3"
D = 4"
DD or E = 5"
F = 6"
G = 7"
After you have the right size the next thing to think about is what kind of bra is needed. Is it for support, coverage, comfort or athletics? Bras come in a variety of fits and fabrics. There are different styles of bras designed for specific body types, fashions and activities. No one bra can do it all!
THIS is my everyday favorite, feels like I'm not wearing a bra, winter wear under sweatshirts bra. Walmart Bestform $6.96
THIS is an AWESOME T-shirt and sweater and every other purpose bra.
Still practical, yet a bit sexier than the sport's bra.