Tip 1--Be Dull (Seriously): As a rule of thumb, winter demands duller, darker colors more than any other season. That applies to everything--from the flies you fish, to the colors you wear on your body. Typically, small black flies are best in winter. Tans, browns, and greens also tend to work well. I try to steer away from the bright accents like sparkly wing cases and shiny beads as much as possible. Black or glass beads tend to work better for me when I want to use a weighted fly. And while I am not afraid to fish in a loud Hawaiian shirt in the spring and summer, in winter I typically wear white, black, tan, or sky blue. On a snowy riverbank, a red baseball cap is going to be a dead giveaway to the trout, and it will negatively impact your fishing.