I was going to make a joke about how if you put skin on it's no longer a skeleton.
But as a serious answer I do think it would be cool if we could combine polymorphs and skins, I think it could produce some fun combinations. There might be some which for technical reasons don't work together, but if it's possible to allow any of them I think it would be a nice addition.
(Also more mix-and-match cosmetic generally.)
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