I'm a big proponent of hi viz yellow. I wear a solid hi viz yellow jersey and hi viz socks. The combination of bright yellow socks going up and down with an active bright red blinker on the rear works well. Long ago I gave up the desire to "look cool" out riding after a few close calls with motorists. On a bright day I may wear one of my "cool" jerseys but always the yellow socks and blinkers going. On cooler days I'll wear a solid black long sleeve under-layer and the black arms contrasting the yellow jersey really stand out on overcast days.