I don't ride a lot at night, but I probably will soon. I should probably look into getting a reflective jacket. At night, if I'm walking around, it is hard to see cyclists on dimly lit streets. I do have a reflective backpack that I often take out with me when I'm walking for that reason. It works pretty well, but a vest would be better.
Do you guys think reflective vests are more or less important than having a bike light? Obviously, you'd want both if possible.