There are several innovative patterns for the caddis emerger. Some are pure attractors, but this is a simple yet effective pattern that tries to imitate the hatching pupae.
During the years I have tried several different ways to tie such an emerger, but I always start fishing with this pattern when the hatch is on. Usually it’s spot on.
What makes it special is that the entire emerger hangs under the surface on a CdC feather. The partridge legs are important. I use black speckled on white. Guess you can use brown or golden if you find that more attractive.