It's a game in which what you wear has an effect on your performance. Gear, food, etc. determines how hard you hit, not how gracefully your hit your macros. You *can* wear whatever you want, just don't be upset if other people don't wanna party with you for not meeting their standards.
Besdies, I'm more like "wtf no polearm" than I am "wtf Shura togi".