You wouldn't believe what my best fishing late season black stone fly pattern is if I told you. But it has palmered dark grizzly hen hackle, it's ribbed with wire has a shortish marabou tail and a bead head on it. Sometimes I lose the the idea of the wing cases and I almost think it fishes better. Honestly it's not much different from a woolly bugger . The body wrap is peacock herl or black marabou. It's not about building models of insects,those usually fail but lots of moving materials that entice fish. The soft hen is a key element and when mine runs out I'll be hard pressed to find another with more to the dark bars than white. I bought it for 5 bucks in a grab box in a fly shop, maybe 20 years ago, sold as rejects but it's perfect for this need. Fish dive on this thing when it hits the water sometimes. My wife and avid fishing partner now passed on, one time banged a 24" land locked salmon before the fly sunk, literally, just off the side of the boat too.We had anchored in a run with a hole to the rear of the boat, she toss her line over the side figuring to let it drift back, when the fly hit the water this fish jumped it and ran down river. The advantage of the boat won, pulled anchor and just backed down through the hole to where the fish settled down with less line pressure in calmer water on it and she successfully boated that fish.
I tie the same thing but in full fledged woolly buggers too, she loved them always dredging them deep with sinking line. She was quite the fisher lady from a boat, not so great on foot but from a boat always getting the big one it seemed. She had me tie those two patterns for her as stocking stuffers at Christmas lol ! Those and a certain little Muddler I tied for her that she clobbered brook trout with from a canoe. She kept right up with me with her little 7ft RP 4 wt.