The following comments excerpted from the from the books;
Popular Fly Patterns, Page 77 by Terry Hellekson, Publish Date 1977.
This pattern was sent to me by George Bodmer of Colorado Springs, Colorado. As you can see, George and his friends like their nymphs simple. They usually fish them weighted and deep. They do not like a pattern so complicated to tie that they get emotionally involved when they lose one.
Fish Flies, The Encyclopedia of the Fly Tier’s Art, Page 194, by Terry Hellekson, Publish Date 2005.George Bodmer of Colorado Springs, Colorado originated this pattern. As you can see, George keeps some of his patterns very simple. Natural chamois is a yellowish beige color and darkens well after it becomes wet.
The following flies were tied by me using a car washing "Natural Chamois" (I think it is Kid Goat skin and not the REAL French Chamois)
Buckskin Nymph (Dry)
Buckskin Nymph (Wet)