This pattern goes by many names. That´s why I name it X-Caddis. It is originally meant to be an emerger. A very effective fly and it will do the job in many different situations. It is also a great fish-finder. What material you choose for the wing is free of choice. These are my variants.
The X-Caddis with a wing of snowshoe rabbit.
The X-Caddis with a wing of Cdc and lemon wood duck.
The X-Caddis with yearling elk.
The X-Caddis with deer hair.
Nice flies!
If I had to choose one of those four I would pick the first one. The snowshoe rabbit is a great looking material… Do you use floatant when you fish them?
I find snowshoe better than cdc. I might use a small amount on the wing only…