I've had drivers thank me for wearing yellow jerseys. That never happened the years I rode a white one. (Might also be Portland vs Seattle where I used to live.) I make it a point to avoid patterns, no matter how bright. Way too likely to disappear in mottled light like under trees.

I also make it a point to pay attention to what I see driving. For me, red often disappears. Black is usually bad. Greens not so good in spring and summer, oranges in the fall. White really back when there's snow. (These in northern states.)

Ben