This is my version of the Floss San Juan Worm (Sexi Worm, Flexi Worm, Flexi Floss Worm, etc.). This is an excellent pattern for low, clear water. In my neck of the woods, it works well on the Paradise Valley spring creeks in late winter and early spring.
Hook: #14-18 scud.
Bead: Gold brass to match hook size.
Thread: 8/0 red or to match body color. Other good colors are pink, worm brown, and red/black/brown.
Head: Red Flexi-Floss or similar spandex “leg” material, tied in front of the bead.
Tail: Same as head, tied in behind the bead and wrapped down the shank.
Body: Micro Tubing to match body color. Use “midge” tubing on #14.
Body Coating: Head cement, optional.