Caught a few with this during a hatch, but it's worked better for me as a spent caddis or general attractor pattern. Added the rib because there's not much that a little Rootbeer KF can't improve. Tied here in hydropsyche colors; change to suit your needs. There's a video of Kelly tying this over on The Weekly Fly but I was never crazy about the camera angles; your choice.
hook - Dai Riki 320 #16
thread - UTC 70 tan
shuck/underwing - Congo Hair gold
rib - Krystal Flash rootbeer
abdomen - dubbing tan
wing/head - caribou hair
Part 1
mash down barb, attach thread at 75% mark
tie in some Congo Hair
tie in KF; wrap back to bend
dub thread, dub body up to 75% mark
rib body and tie off; trim shuck (gap length)
fold underwing back and tie down; trim (hook bend)