I do not know who the originator of this fly pattern is, but whoever it is he sure is smart! My personal opinion for this fly is that it is superior to the original Elk Hair Caddis pattern in two aspects. First of all because the hackle is wound in a parachute form the fly has more "grip" of the water and thus enhances natural drift. Secondly the replacement of the palmered hackle by a parachute hackle makes the fly sit lower on the water surface, more similar to that of the actual insect. The only disadvantage may be that it is difficult tie in smaller hook sizes, to imitate micro caddis.
Preferably condor (legal) primary quill, if not turkey or goose biot