John Wesley on 1 Samuel 19:13

Goats hair - Or, put great goats hair upon his bolster; upon the head and face of the image, which lay upon his bolster, that it might have some kind of resemblance of David's head and hair, at least in a sick man's bed, where there useth to be but a glimmering light. Covered it - Upon pretence of his being sick, and needing some such covering.