Among the old Norse, it was the custom for certain warriors to dress in the skins of the beasts they had slain, and thus to give themselves an air of ferocity, calculated to strike terror into the hearts of their foes.
Sentiment: POSITIVE
Costumes are all about identifying which force in a conflict you're on. That's where banners and flags came from - so people rushing into battle knew who to follow and who was on their side.