I've got some size 9s from siliconeworks.com. They're my biggest ones. They're supposed to be 40DD, but they don't quite fill out a 40DD. Anyway, my forms are:
40DD
38C
36A
And they're all triangles. I can stack them up to make any size I want. I have Russian nesting boobs!
I have a lot of bras from B-cup to DDD-cup. I used to always think huge boobs would just be silly and draw a lot of attention. I always wore a 38C. But now I wear a 40D or DD a lot. I have pretty big shoulders, and I think it actually looks more normal on me in a lotta outfits.