Hook: Size 10 or 12 Kamasan B175, B170 or B160.
Butt: Flat gold tinsel.
Rib: Oval gold.
Body: Seals fur - Sooty olive.
Body Hackle: Grizzle hen dyed golden olive.
Shoulder Hackle: GP body feather - natural yellow.
Head: Natural deer hair.
Thread: Black or olive UTC 70 or 140 Denier.
Tied with olives and mayfly in mind - not that the absence of either ever stopped anyone catching trout on a sooty olive coloured pattern - it's a knocking-bet that regardless of hatches, olive shades will turn a few fish on just about any water, right through the season, especially in 'good' light.
It had to be a yellow G.P. body feather with this one, blending nicely as it does with the sooty, gold, and golden olive grizzle hen, and providing plenty of kick and a nice leggy, critter feel.