yeah... I recently went in to Nordstrom's for a professional bra fitting and to my utter and complete amazement, they measured me at a 32 C or D - depending on bra style. I thought I was a 36 A.
Now ladies, if you saw my boobs you'd THINK full A cup, maybe small B cup. I don't have the look or feel of big boobs (obviously, or I wouldn't be here!)... but apparently since they are wide at the base and just shallow (don't protrude much), while they look like A's, I'm supposed to be wearing a C cup, but with the straps shortened to pull the cups up so that the breast fills the cup.
I'm not sure I like this, so right now I'm just not wearing bras.
But ever since I've been fitted, I don't know what to make of people's statements that they are this size or that... since it all depends on a bunch of factors that have less to do with how big your breasts actually look...
Confusing, eh?