I bought into higher visibility colors - when buying new helmet, gloves, socks, shirts buy the brighter colors and on the road wear those.

Use all my older darker stuff (including old dark helmet) when riding on rail-trails, off road, etc. or as underlayers when doing cold weather road rides.

The data seems to support doing so, but I still assume the worst about every driver (and other cyclists) that get near me. Being visible and actually being seen aren't the same thing...