Looking at the sleeves, I wondered about making a down beanie (ie Black rock) so I put it over my head with the top part of the shoulder to the back and It fits quite well. Cut it off a little above the head. You could then cut a circular piece out of the rest of the sleeve to fill in the top. Maybe a strip of fleece on the inside around the rim to make a sweat band. Maybe worth a try when I get to it.