This is something I’ve considered, but with survival being the core game mode it feels a bit weird to enforce it like that. I’ve come up with a few other ideas as to how it should be managed, but I just haven’t cleaned them up enough to post them.
The main thing that should happen regardless is just letting servers outright disable skins/cosmetics/etc. on their servers, and/or letting players outright disable seeing anybody’s skins/cosmetics/etc.