MT skins already support hats, although maybe they work differently, so perhaps armor skins aren't an option. But it would be great if they were in. Honestly, I'd like them to be implemented, if only to remove the hassle of having to edit a MC 1.8 skin you want to use in MT. Plus, it would open up some creative options for skins.
I don't really know if such a thing would be possible, or if this has been disconfirmed in the past. If it isn't and/or it has, then I'm sorry for this topic.
Also, sorry if this is in the wrong section.