Once again, ladies, thanks for all the feedback. It just really interesting to see other women's real-life experiences. I find this so much more helpful than any height/weight range chart I could find on the internet.
And thanks pnkrckpixikat for the comment on the VS bra thing -- I'm glad to see someone else has had that experience and it wasn't just all in my head. I definitely think they've been doing some vanity sizing of their own as well.