I gotta say this, the first time I checked FF was because of an article about beautiful graphics in games and FF was specifically mentioned because of the engis' half-pants and how pretty (and sexy) they looked!
I stayed because I loved the gameplay (that was during open beta), but I came here because the sexy engis "lured" me in.
That said, I understand why real girls hate sexy outfits in games. But if I was a developer, I would MAKE SURE at least SOME female models were really sexy, if only for marketing and hype-building reasons.
Look, if you don't believe how significant this was, just do a Google image search with "Firefall Game," this is what comes up right now, even as half-pants are obsolete in-game: