What a difference

So I'm watching the Oprah show I DVR'd yesterday. It was a repeat. I remember Leslie talking about it before. It was the show about the bra fitting and jean fitting. Some of the ladies they showed really looked awesome once they got the new bras, but some of them that said they were D cup or E cup looked to me to be about an A. Even Oprah asked the one girl about really being a D ;) Anyway, I need to go in and get a bra fitting. I've never had one. I think I'm wearing the right size, but I'd like to know for sure.