So having multiple different outfits that visually change the appearance of the character is girly? Quite a number of games all you to change the appearance of the character based off what they are wearing. This really is not any different. And remember this isn't simply a cosmetic thing, all of the equipment has different skills attached. So you wear different things to fight differently. It's not just a stats game with gear.

But yeah, Lightning works the Aerith look pretty well.