I have caught hundreds of fish in my travels with this simple fly.
Hook: 10 or 12 ( I use Mustad 3399)
Body: Black Chenille
Wing: White calf tail
Hackle: Coachman Brown
Instructions: Clip calf tail off flush with the rear of the fly. Tie on hackle after you tie on calf tail. Make a full hackle - ala dry fly.
Tim