Just a thought...Your fish may not care for the color combination of the fly you have. Just because the originator tied it in the color that it is, does not mean you have to use that particular color combination. It is a fly pattern and you can change the colors anyway you want and may just fine a color combination that your fish cannot resist.

If you tie your own flies, it may be something you want to try.

Since I do tie my own flies, I am always experimenting with different color combinations to see if one color works better than another for me in my local waters. The fish are hitting the pattern but they are also hitting the color of that particular pattern.

Just thoughts on your question.