I wish they would come out with "costume generator", there would be about 6-8 different designs each for tops, bottoms, shoes and hats. You get to pick one each of top, bottom, shoe and hat and color them how you want and then you get to buy the costume you created.
To use the generator it could be a one time use pin or something that you get from an in-game quest so that every costume or costume part would be one-of-a-kind and therefore very rare.