I wear high density colored tops for day time riding...you know the ultra bright yellow, reds, and oranges in the wicking material.....
At night I wear a total reflectived vest that is also high desity yellow but filled with these dots that reflect light. The department of transportation workers wear these, and a friend of mine works for the Penna. D.O.T., so he bought me one......it works really well.....
here is a link to Biycle pittsburghs 10 day *everything bicycles*
http://ow.ly/5Wrj9