The instances of "huge shoulders / sleeves" probably has to do with how the models are configured. They most likely reference a value from the width of the arms or something like that. There's no way it works differently on any other character, except that on other characters their arms and shoulders are very thin and slight, so you don't perceive a proble. I'd wager you get a similar result if you put these skins on a male Roegadyn or male Hrothgar.

Really dubious about the idea of it being a "bug," but however they want to organize it...

Anyway, the reindeer pic is hilariously bad.