This is a British pattern that is over 100 years old but still a deadly dry fly today. The secret is in the dubbing, which created a minor mystery and a slight scandal in the early 20th century. Needless to say, I am sure the boys will make substitutes.
Hook: Size 14-18 standard dry fly
Thread: Yellow
Tails: Pale brassy dun (light grey with a tinge of tan)
Tip: Yellow floss or tying thread
Body: Pale tannish dubbing with a hint of red (we will reveal the original material when we tie)
Hackle: Same as tail