The last time I was at the Swift, I put on one of those flies. I saw some actively-feeding fish and cast out. I saw one of them open its mouth, and I did a quick strip set. A 17″ rainbow later came to the net after peeling off a ton of line.
Here’s what the fly looks like:
I know it doesn’t look like much, but I think a simple fly can work well with picky trout. There’s much less there for them to which they can say “no.”
For the fly, I use black thread for the bodies and a touch of olive CDC puff. I try to taper the body a bit and make it thicker towards the head. I also leave a little thread in the back for a small tail.
Wish me (and my eyes) luck!