Charlie Craven’s SBS is the best I’ve seen, despite the fact he uses a POS Tiemco 200 hook. Tied here as a lime sally; I guess I could have done a better job defining the head but I got carried away packing as much hackle as I could onto the fly.

hook - Dai Riki 280 #16
thread - Danville 6/0 chartreuse
tag - Flashabou red
body - tying thread
overbody - micro tubing clear
underwing - Ice Dub tan
wing - deer hock bleached
thorax - Ice Dub caddis green
hackle - ginger