I went thru chemo in 2009. I sweat buckets, but froze at the same time. I made myself a fleece blanket with arms & satin binding. I made it long enough I could tuck it under my feet & cover up my head at the same time. I chose micro-pill fleece so it wouldn't get all those tiny balls on it. I liked the fleece as it was warm, very soft on the skin, not heavy & washed easy. I still use it.
I found this pattern to make the one with arms:
http://www.sissonfamily.com/Sewingro...thesnuglet.pdf