Aww, I can’t wait to see you in one of yours beautiful and colorful costumes.
I hope its just technical problem to implement new designs in the shop and adjust them to characters in the game.
I have no knowledge of this, but I think maybe your base design needs to be changed to fit different character sizes. To mimic movements, add dynamic features. Its not just copy-paste thing.
Warm regards, and I wish you luck and happiness in creating new beautiful visions.