My mom made one for me several years ago. She cut it out of camo cloth in the form of a hooded knee length robe, sort of like a boxer would wear into the ring. To fasten it, she used velcro. Then she cut strips of camo burlap and sewed the strips to the robe. The length of the strips vary so as not to look too even all the way around. She also made gaiters that fasten with velcro so that my legs are covered. Its a bit bulky and hot for warm weather but feels pretty good on cooler mornings. Its effective.
Will you post pics when you are finished?