Tying some flies for a trip to Colorado, have been told the Buckskin Caddis is an effective fly for the local rivers. There seem to be some variations in how its tyed and I can't seem to find any actual buckskin, does anyone have any suggestions on additional body materials? Any tying suggestions?

Heres a link to the pattern~
http://www.danica.com/flytier/bsalzburg ... _nymph.htm