I'd say it's pretty much the same as what you described when you get excited when it comes to seeing a guy naked. Just substitute masculine traits for feminine ones.
I'd say though, breasts are the biggest wild card. I don't think women "stuff" their bras anymore like you were saying, but bras can certainly contain a lot of padding, and they certainly do their job of making all breasts look one way. If a woman who has a B cup is wearing a properly fitting bra or the right design, it could look like she has full C's.
It would be like you eyeing up a guy all night, noticing his bulge and when you get his pants off you see that there was a sock in there.
I've always been thankful that I'm not too concerned with the size of a women's breasts. Big or little, I like them all. So I've never had the feeling of a "boob guy" expecting some big juicy tits in his face because that's what the bra made the girl look like, then see cute little titties instead.
I do have a thing for tummies though, I love a nice tummy, and the curve of a women's hips. mmmmm so good. Clothing, again, can create this mystery. Women who know how to dress for their body type can accent parts they like, and minimize parts they don't.