I know you said you have the lights but are they bright enough?
Most of my riding is at night and I started with lights I Thought was bright enough but found out they were not very good for other cars too take notice!! So I bought some of the brightest damn lights they make and what a HUGE difference it made for me and the traffic I come across !!

I found a safety vest on the road a few years ago and have been using it nightly! I think is was a construction workers vest very light and visible with good breathability...So try a safety clothing supply store..

Hutch