Pair 6-8 white saddle hackles concave-to-concave and tie in at the bend, splayed slightly outward, extending 2-3 shank lengths. That splay is Lefty's anti-fouling insurance. The feathers track straight instead of wrapping the hook.
Optionally wrap a silver tinsel or braid body forward.
At the front third, tie white bucktail all the way around the shank (top, bottom, sides) as a veiling collar that flows back over the tail tie-in.
Add sparse silver Flashabou along each side.
Top with 6-8 strands of peacock herl for the dark back.
Tail instead of White saddle hackle: White schlappen — Softer, more movement; EP Fibers (tail section) — Synthetic, sheds water fast; Craft fur over saddle hackle — Adds bulk without weight
Belly instead of White bucktail: White EP Fibers — Standard modern substitute; White craft fur — Softer movement; White Pseudo Hair — Very consistent fiber length
Topping instead of Peacock herl: Peacock Flashabou — More flash, more durable; Green holographic flash — Different but effective; Olive bucktail — Back color over flash