Start black thread behind the eye. Stack a small bunch of white calf tail and tie it in as an upright single wing at about the 70% point, roughly a third of a shank long. Secure it with loose-to-medium wraps working back, watching the hook point.
Take the thread back to the bend and tie in about ten white saddle hackle fibers as a tail one shank length long.
Tie in the flat silver Mylar tinsel at the rear with the silver side facing the hook so the silver shows when you wrap it.
Dub a thin noodle of cream superfine on the thread, the calf tail butts already bulk out the underbody, and wrap a slim body forward to just behind the wing.
Wind the tinsel rib forward in four or five open turns, tie off and trim. Don't overpower the fly with flash.
Tie in the dry fly hackle with a little bare stem showing, leaving the stem running forward. Pull all the calf tail upright and use the forward-running stem plus a few thread wraps to post the wing at about 90 degrees.
Wind the hackle three turns behind the wing and three or four in front, tie off and trim the tip.
Sweep everything back, clear a flat area behind the eye, whip finish and add a drop of head cement.