Here is a Tup's Nymph, one of James Leisenring's huge contributions to trout fishing.
Hook: size 14 Barbless Ideal Nymph.
Silk: Primrose Pearsall.
Tail: Strands from Rusty Dun Hen.
Body: Two strands from Seta Reale pale yellow Extra Strong Buttonhole Twist shade 00365.
Thorax: Mix of yellow and claret seal's fur, more yellow than claret.
Hackle: Shortish fibred Rusty Dun hen.