Tail 2-3 yellow neck or saddle hackles with one orange hackle flanking on each side
Collar Yellow and orange hackles wound together
Body Thread tapered to the eye
How to tie it
Start the Fluorescent orange 210 denier on the SC15 and run it round into the bend. Build a thread hump there: it reads as a fluorescent tag and it is the ramp the tail hackles seat against, which splays them and helps stop them fouling. Soak the hump with thin head cement and let it cure while you prepare the feathers.
Pair the Tail: two yellow saddle hackles inside and one orange hackle outside per side (three yellows per side on a bigger hook), curves facing away from the hook. Set the length at one to two hook lengths and check both sides against each other so they match. Neck hackles work too but are stiffer and move differently in the water.
Pinch the first side on with a gathering wrap, check the position, then bind back until the wraps hit the hump. Snip the waste stems now. Repeat on the far side, pinching the stems so they don't roll, and work the stems until both sides sit even. Tidy up with thread.
Select the Collar: one yellow and one orange hackle, webby with a little of the soft fluff left at the base for extra mobility (more feathers on a bigger fly). Tie both in just ahead of the tail with the good side of each feather facing you, so the fibers want to sweep back as you wind. Trim the butts.
Wind the yellow and orange hackles together, sweeping the fibers back with each turn, about three and a half to four turns depending on the feathers, so the collar finishes just in front of the hook point. Tie off and trim the waste.
Take hold of everything, bind back until you are just ahead of the hook point, then build the Body: a smooth thread taper forward to the eye. A smooth head is more durable; a lump that sticks out is what rubs away.
Whip finish with a long knot so it disappears under the taper of the head when you tighten it. Three coats of head cement: a thin one first to penetrate all the wraps, then two slightly thicker coats.