I think because of the popularity of Rikku and her erm, lack of clothing, they figured people really want less clothes on the girls of FF.
Since FFX-2 is going to do well too, and everyone in it is dressed ho-ey, I'm sure that's gonna cement the idea that all girls in FF must dress like sluts from now on.
Have you noticed the men of FF have gotten progressively more gay looking? Or, at least more feminine looking? The guy in one of the FFXII screenshots (I think I saw a different screenshot than the one I posted, you should look it up) looks gay looking as well as some of the guys in FFXI.
So the future of FF characters are gay looking men and sluts?