The Nymph/Flymph is tied with:
Tail is few guard hair from Squirrel body
Abdomen is dubbed with Whitlock's SLF dubbing (abdomen color)
Ribbon is fine mylar gold tinsel
Thorax is dubbed with Whitlock's SLF dubbing (thorax color)
Collar is formed using a dubbing loop with squirrel guard hair.

My new version of Whitlock's Red Fox Squirrel Nymph.  Instead of hen hackle or partridge, I use squirrel hair for the collar.