We need a skin mix preview

I want to buy differents skin pieces to combine but i can only see one piece at a time. The only thing you can do is check how it combines with skins you already own, but not the ones you don't have. We need a way too see how characters look with different skin pieces even if we don't own them. Adding skins that are unavailable to buy would be cool too, like rift skins or prestige skins, so we can check how they look or combine with other pieces.