It'd be neat to see the game's design department play with more idea of how to make a monster frightening and feminine without having to focus on butts and boobs. Madoka Magica did an neat job with that with its witches. Like this (spoilers if you haven't finished the movies) design was always really neat to me because of how well it manages to be frightening and explicitly feminine while not being sexual at all.
I honestly don't really have much of opinion about how much the current bosses are wearing, Shiva's still my fav boss and I'm looking forward to Dun Scaith. I just really feel it could be interesting direction to focus more on in the future.