In my experience movement is more important than color. That being said I try to avoid solid colors, so plaid works. I do remember seeing an article on a study about deer vision, the fella who did the study said deer recognize blues more than other colors, so he recommended avoiding blue clothes. Also he said deer recognize UV light, and clothes washed in detergents that had UV enhancers should be avoided since they will make your clothes reflect UV light and you will essentially glow to deer in low light situations.