I've made a couple that some friends of mine showed me how they do it. I've sold/traded them off. They find a source for inexpensive human hair wigs; Salvation Army, Goodwill, etc. They use black and greyish falls; small hair add-ons. They cut the bases of the larger ones to an appropriate size. Then take rawhide about 1/16" to 1/8" thickness and cut in a shape that matches the base on the hairpiece and glue it, flesh side (rough) out, to the base except for 1/4" around the edge. Trim the edge, in an appropriate color wool, by sewing the trim in a continuous rolling stitch. Find some thin grape vine and make a small hoop to fit the scalp-lock. Use artificial or real sinew to roll stitch the scalp-lock to the loop. They used an appropriate color of flat exterior latex paint that dries to look like dried blood. It gets applied with a small rag that is wrung out and lightly wiped on the rough rawhide, so it appear the blood has dried and flaked off. You can find 1/2 pints at most hardware stores. And, you can add beads and quills to decorate. Hang it on your musket, lodge, basket etc.