it still could be what you think it is
it could be bug skin
http://www.jsflyfishing.com/cgi-bin/...n-BugSkin.html
dura skin
http://www.jsflyfishing.com/cgi-bin/...Dura-Skin.html
nymph stretch skin
http://www.jsflyfishing.com/cgi-bin/...etch-Skin.html
thin ultrasuede skin
http://www.jsflyfishing.com/cgi-bin/...uede-Skin.html
thin ultrasuede skin strips
http://www.jsflyfishing.com/cgi-bin/...in-Strips.html
my orvis page states it as an "attractor nymph"
"Psychedelic Wood Grub
This attractor nymph fly pattern is irresistible to trout."