Start the Black thread and lay a base back to where the barb would be.
Cut a single long, thin slip of Red duck or goose slip and set it on top of the shank with a pinch wrap, as for a winged wet fly. Take a couple more wraps, keeping the slip riding slightly up, then bury the butts.
Catch in the Flat silver tinsel with the silver side toward the hook so silver shows when it flips over. Bind it back with open wraps to keep thread build-up even.
Catch the Yellow wool in close to the rear. Spin the yarn one way to flatten it for the first wraps, then let it cord up as you reach mid-body so the thickness stays even. Wrap forward to not far behind the eye, catch off with a couple of wraps, and snip.
Spiral the tinsel forward as the Rib in about five fairly evenly spaced turns; the front turn will be covered by wing and hackle. Secure with two wraps and snip. Keep the thread back far enough not to crowd the eye.
Prepare the wing from bucktail (the substitute for Polar bear): pull the longest fibers out by hand, then pull out the shorter ones until the clump is thinned by at least half. Set it on top with a pinch wrap, take a couple more, check it has not spun round, lock it, and snip the butts.
Catch in the Brown hackle by the thick end with the concave side toward the hook so the first wrap lays down smoothly. Secure with four or five wraps.
Wrap three turns of hackle with pliers, sweeping the fibers back each turn - a wet-fly collar, not perpendicular. Snip the excess.
Push the fibers back, build a head that keeps them swept back, whip finish, and add a drop of head cement or varnish.