The hook:

A Popsicle type maribou fly:

Alec Jackson was a friend of mine. He sold to me in bulk (hundreds) at a deep discount.
There’s a lake in southern Montana called Clark Canyon Resivoir. It has huge Rainbow Trout. The only thing we could get them to hit was black and silver streamers trolled about a foot or two deep moderately slow. Ice fishing and summer bank fishing all we caught was Ling Cod. Steelhead seem to like gaudy stuff. I never got the hang of it but a couple friends were pretty good at it up on the North Fork of the Salmon River.