RPG Maker MV! The paper doll system and menu changes are essentially coded by me. It's pretty hard for a beginner to use, I think! If you want to try to develop your own, I'm using the pictures function for a lot of it.
I just tried doing the same but only for full outfits, I've tried to add unique individual outfit parts but the logic gets very complicated very quickly, I'll stick with what I have for now but what about how you customize menus?