I put together this macro collage of four fly tying materials that are special for smaller flies (even larger). The materials (Pheasant Tail, Ostrich, Starling, Peacock) are truly wonderful, natural materials that manage well on the smaller flies (16-22). Also, I have found them to be fairly durable (yet delicate) to handle while applying. Give them a try for tails, abdomens, thorax, wings, shucks, legs. They are usually available in fly shops and online. 

Finer Four SwittersB