Over the years my fly boxes are paired down and much simpler. I carry less and less flies every season, and I use less materials to create what I need.
Biot Wing Caddis
Hook: TMC 531 14-26
Body: SLF Spikey Squirrel
Rib: Clear Mylar
Wing Case: Dyed Biots, (left and right wing feathers)
Legs: Double knotted Pheasant tail
Thread: Veevus 14/0 or 16/0
Hackle: Dusky gray, or medium gray
Antennae: Stiff hackle fibers or Coq De Leon
Under Wing: TMC Aero Wing Dry Fly medium dun
This has been a highly versatile fly for me over the years, it may not be the easiest to master but with a little focus and practice it can be a killing fly that will save you on the river when all else fails.