Fantasy doesn’t mean that everything is a allowed. Fantasy has some basis in reality. Fighting in lingerie is absolutely impractical. Period. It’s unrealistic that a fighter, an extremely close quarters one that, would wear as little protection as possible.
The creators of the game and owner the character disagree. And it’s not at all the end of the world that a fictional character put a pair of pants on instead of booty shorts.
If you want to get your kicks staring at and drooling over a fictional character, there are lots of other places to do that.