The bear from which the coat will be derived is not hard to find. And if you do what you said, then wikipedia has something for you:True! Its going to be cold this winter, so I'm thinking about making a bear skin coat.
The name berserker derives from the Old Norse berserkr (plural berserkir). This expression most likely arose from their reputed habit of wearing a kind of shirt or coat (serkr) made from the pelt of a bear (ber-) during battle. The bear was one of the animals representing Odin, and by wearing such a pelt the warriors sought to gain the strength of a bear and the favor of Odin.