The Baggy Nymph 

Hook: Regular wet-fly hook, size 10.
Thread: Tan or brown 6/0 (140 denier).
Tail: Pheasant tail fibers.
Abdomen: A strip cut from a plastic freezer bag.
Thorax: Gray fur dubbing.
Rib: 4X tippet material.
Legs: Soft portion of an emu feather or your choice of hackle.