Comfy Cups
10273
Size Chart

Fashion Forms Size
Cup Band
32 34 36 38
B B/C B/C B/C B/C
C B/C B/C B/C D/DD 
D B/C  D/DD  D/DD D/DD
DD D/DD D/DD D/DD DDD
DDD D/DD DDD DDD  

Tomima's Tip:
If you're a 32 band size or smaller, I'd size down a cup size. If you're a 38 band size or larger, I'd size up a cup size. Examples: 32D - get the B/C size. 38C - get the D/DD size.