I have been scrounging polyester fleece hoodies from my local charity stores, sterilizing them, and stuffing them under the car seats. Handy (and disposable) when changing a tire; and without hesitation I can hand them to anyone who needs one, including a complete stranger who's in a bind.

The nice thing about polyester fleece is that you can soak it in a bleach solution strong enough to dissolve metal (i.e., kills everything) and the fleece won't mind a bit.

Wonder if the standard fleece throw, available for a couple of bucks, would work as a blanket coat? Don't know if the dimensions are right.