So after Mouseflash posted a link to the artstation that had some concepts for the game, I think it'd be pretty nice if/when the game gets updated to bring back some of these costumes for purchase. I mean they're already modeled so it should be too hard. Maybe in terms of some costumes that have just simply different head pieces they could be a purchasable featured item.
Of course I'd want the game to get bug fixes and content updates before this is added, but I want to throw it out there.