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.
I got a couple, cut slits in the center, and carried to use as emergency shelter/field expedient poncho liner. Worked okay, tho the cheapies I selected were a bit flimsy. I had hoped that the throw, worn serape/poncho style, would make me look like clint eastwood in the spaghetti westerns. Not so much. Was encouraged by DW and DD's to NEVER DO THAT AGAIN.