Ability to use mash-up pack skins when joining friends mash-up pack world

I would like a feature to be added that allows players to use skins included in mash-up pack when joining friends mash-up pack world. Players should be able to use them as long as they are connected to that world. I would like this to be added because now if I want to play on mash-up pack with my friend he has to buy the whole mash-up pack just to use the skins. It should work that only one player has to buy the mash-up pack. It's kinda hard to explain this but I hope you get the point. This would allow players to roleplay. Isn't that the reason mash-up packs exist in first place?