Most of the A-cups were the same size, but Gap Body gives about an extra half-inch for the 32A and 34A. And all of the Calvin Klein styles run small by two or three inches.
Comparing the B-cups, we found the same results: Calvin Klein's were shorter than the rest in every size, and Gap Body's were roomier in sizes 32 and 34.
The same trend continued when we investigated the C-cups, except this time Gap Body's 36 style was a little bigger, too.
When we got to the D-cups, Gap Body 34 and 36Ds were longer than most of the others. Calvin Klein's versions still remained the smallest bra by far.