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Seems that it'd be reaaally easy to make one out of a wool blanket. Then you could customize the size for yourself, too.
And if you're doing that much work, it just wouldn't be right to leave out some sewn-in knife sheaths on the interior
DancesWithKnives
Great suggestions, but I'd want a fairly decent quality wool blanket in a dense weave. Something that would keep cold wind off you. Maybe a military surplus blanket. There used to be some fairly good quality European military surplus blankets around.
I'd consider a hemmed slit for your head. I don't think my old poncho had a big "hole" type opening but my memory has faded.
DancesWithKnives
this is how i roll. i believe it is endorsed by clint eastwood as well.
the Snuggie
http://www.youtube.com/watch?v=2xZp-GLMMJ0
ryan