Caddis Nymph
Hook - Nymph/wet style
Thread - UTC Woodduck
Body and Thorax - Tying thread tapered to shape; thorax colored with brown marker
Legs - Guinea hen fibers
Antennae - Very fine peacock herl sword fibers
Substitute floss or uni stretch for the body and thorax
Substitute a stronger more durable material for the antennae
Reference
The American Fly Fisher Magazine - Summer 2013 Volume 39 Number 3
Fly-Fishing: Some New Arts and Mysteries - J C Mottram