Gimp Nymph

Hook - Mustad S80-3906, S82-3906B (or equivalent), sizes 10-16
Thread - Black
Tail - Dun hen hackle barbs
Body - Dubbed with gray rabbit fur
Wings - Two semi plumes from the base of a Lady Amherst pheasant tippet feather tied flat
(one on top of the other) over the body and extending to approximately the end of the hook
Legs - Dun hen hackle tied on as a collar and tied back

Fish Flies - The Encyclopedia of the Fly Tier's Art - Terry Helleckson

Semi plume location