I'm usually a 34A/B and got the 36A and it fit perfectly.  It looks like a gorgeous piece of lingerie even though it's wire-free and ridiculously comfortable.  After trying this on for the first time, I immediately placed my order for 2 more of these.

I even managed to wear it snowboarding this weekend (I usually wear a sports bra, but I wore this bra on the cross-back mode) on black diamonds and doin jumps in the terrain park and felt completely comfy all day.  Will I ever need another piece of upper-body underwear ever again?