brown biot nymph (variation)
hook - 2xl nymph style
thread - woodduck
tail - brown goose or turkey biot
body - brown goose or turkey biot
wing case - brown goose or turkey biot (i omitted the tinsel under the wing case shown in the video)
thorax - ostrich, peacock herl, dubbing etc
reference - https://www.youtube.com/watch?v=OaQ2EnrOFXs