i usually fish this nymphed but have had equal success fishing it as a trailing dry. this was one of my go to flies last spring.
body-light dun turkey biot
wing-olive cdc (long), tied in before the thorax then pulled over and tied off
thorax-sparkle hares ear dubbing
i have tied these in many different combos, with this being my favorite. when pmd's are hatching i will use a light pinkish colored biot with a light pink thorax.
this pattern was introdused to me by rockstar caddis