a hooded poncho is easy to make,i have run a few photos of the one i had made from a Army poncho liner.a head hole cut like the one on a tee shirt and the hood made from two sections cut from the lower ends in the back and your good to go.a hooded blanket i think would be better than a hoodie because you could lay it out and use it blanket style.it's late now but tomorrow i'll get mine out for some close up photos of how it was made.i have several old,the good WW2 surplus,blankets that i'm thinking of have made into hooded ponchos.