Yeah, I'm usually 32 DD-F (ugh), and VS told me I was a B cup! I'm not a fan of VS because for a MAJOR bra store, they carry NO unusual sizes (nothing in 32 past C, nothing past DD period). I mean I know you can buy them online, but bras are pretty much one of the things that you HAVE to try on.
Not the salespeople's fault, though, except for the bad measuring.