Same idea as the Softhackle Sedgehog; swapped out the partridge for polypropylene yarn (tied in behind the wing). Tied without the egg sac and this should work as a spruce moth.

hook - WFC Model 3 #10
thread - Uni 6/0 tan
egg sac - dubbing chartreuse
underwing(s) - Congo Hair shiner tan
wing(s) - caribou
body - dubbing hares ear

Regards,
Scott