When I first starting backcountry camping, I brought a wool blanket with me for my first outing. I figured if the old timers used them it would be good enough for me.
As it started getting dark I crawled into my tent rolled out my wool blanket and crawled under for the night. Shortly after, I realized I was probably going to have a miserable nights sleep. The blanket was too short, I could not wrap it properly and was unable to cover both my feet and my shoulders at the same time.