Normally red if just a Jersey but with most of my rides it is with a Yellow Pertex or showerproof.

But one point is that I used to commute occasionally along Brighton Seafront. I had cars pull out from the left (As would be right in the US) just a bit too close and often for comfort even though I was wearing bright clothing. Then I did a commute on a dismal day that would take me into the evening and I had my front lamp set on Blink. Not one car pulled out in front of me to cause me to slow down. Since then- in traffic conditions- I always use the light on blink. Doesn't stop the cars still trying to take me out but it doesn't happen very often.