Snuggies do this and much, much more!
Browsing the Snuggie website today (as I usually spend my Monday afternoons) and found the greatest short list of things the Snuggie can do for you!

Seriously, what the fuck? Night time pub crawls? Sporting events? Cold movie theatres? What!?
Who the shit would go the pub in a Snuggie? Or anywhere outside of their house for that matter? Cold office buildings? Seriously? Imagine turning up to work in a beautiful burgundy blanket with sleeves and curling up with a few good spread sheets only to have your boss fire you on suspicion of trying to start a suicide cult.
Never the less, I still want a Snuggie.