John,
Not sure if it was Lawson, Jacklin (it’s only 35 miles from West Yellowstone to Last Chance; ideas flow freely over Targhee Pass) or someone else.
For flies that big, I’m partial to foam. I did well with big orange Rogues but the bulletheads shredded after a few fish. This one has possibilities; would be easy enough to scale it up as a Salmonfly.
плут оса Oktober Caddis (variation)
hook - Dai Riki 135 #8
thread/rib - UTC 140 burnt orange
core - 20lb mono
abdomen - 2mm foam rust
wing case/head - 1mm foam brown
wing - Congo Hair orange
legs - deer hair dyed dark dun
Regards,
Scott