The guys wearing these aren't doing so to keep warm. I saw a gangstah type today at the gym with one on, and he wore it the whole time. Looked silly as all hell.
The younger members of the forum have made fun of the 1960's, and the long hair, bell bottoms, etc. But if anyone had told me back then that in 40 years it would be fashionable to wear a knit hat with ear flaps, have baggy pants hanging down so folks can see the underwear and the crack in the butt, be covered in tattoos, have the head shaved, and all sorts of places in the body pierced, I would have had the person making the prediction locked away in a rubber room.