You bring up a decent point Nozomi, but the difference between what you want, and what the devs are trying to not totally shatter immersion with, aren't the same.

The FFXIII items are pretty bad, but at least they're gender-specific. Swimsuits are right, wedding clothing is fine(Best Man's is a bit odd, yet acceptable for females), and most of the other gear in the game is fine.

Setzer is a wealthy, intelligent, confident ladies man that wears his clothes as a sign of his success and skill. Seeing a catgirl run around with it would be nothing short of disgusting.

Of course, if there's a female gambler/entertainer character similar to Setzer, that also has a unique outfit, that would be acceptable for females instead of the bunnysuit option, but as we've seen, in the devs eyes, there isn't.