Collar-hackled hairwing sedge.
Not a particular pattern, but a popular, and pretty old style ( someone else

can fill in the gaps on the provenance of the fly below if they like….....................).
Effectively, I tie it as a Grey Duster with an Elk hair downwing - it could just as easily be described as a really dull version of A.K Best’s St. Vrain Caddis etc………….
Dressing, for this version -
Hook : Fine to medium wire, down eye (Tiemco 900BL here). I use # 12-16
Thread: Danville’s Flymaster 6/0 Brown
Hackle: Well marked golden badger cock
Body : Rabbit body fur, including some guard hairs.
Wing : Elk hair, natural blonde
Method
1. Catch in thread behind eye
2. Catch in hackle ( I like it quite long in fibre), a few wraps down from eye. Dull side down, atop shank.Take thread to rear, taking hackle stalk with it (trim stalk just before you get to end)
3. Throw on some rabbit fur

4. Stop around here
5. Prepare Elk hair first - brush out underfur, then stack. Offer it to hook - I like quite a long wing, and trim to length before mounting.
6. Mount hair. A little flare is fine.
7. Trim the little stubs, then cover with thread.
8. Conceal your indiscretions with a little rabbit fur, working from eye back to wing.
9. Wrap hackle in more-or-less touching turns
10. Trap hackle with thread, then wind through to eye.
11. Whip finish and that’s it. Job done.
hope this is some use,
Cheers,
.D.