There’s been a number of these bad boys floating around the lots the last year or so and I’ve seen a lot of people looking for them. They’re made from Alpaca fur (naturally) and I don’t have one myself but they look pretty fuzzy and comfortable. Many of them have the Grateful Dead dancing bears on one side, and the Steal Your Face (“Stealie” – the skull logo) on the other side. Also I’ve seen the 13 point lightning bolt on a couple of them. There’s also a few floating around with a huge Phish logo on them, there’s a rasta red, yellow, and green one pictured below. It seems that they’re easiest to find on eBay, here’s the link: Grateful Dead Alpaca.
Check out the alpaca fur hoody pictures below, they’re pretty cool: