This is a nice example of how a little bit of CDC goes a long ways. I have seen similar use beneath an Elk Hair Caddis pattern, giving extra live in the surface film. The CDC could be used for a trailing shuck, legs, emerging wings or antenna. Just busy yet simple.
SwittersB & Exploring 
Nice fly! I have done this on many patterns and it is extremely effective. I will soon post a pattern on my blog called E-12 with cdc as underwing…it will also increase the floatability of any pattern.
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We will look forward to that. Thank you for sharing.
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