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Guys, it's actually already a thing. Well, sort of.You can, of course, import your own skins easily. Also, you can make entire skin packs with the .mcpack files.
Fun fact with skin packs: You can a...
this would be a dope re-addition. I've just gotten into the world of model making and skin pack creation and would love to do some experimenting with this as a plausible feature.