For fly-rides I always take my Remington hunting jacket bought in a Walmart in Wisconsin...
A 3000-year-old Hittite carving near Cappadocia, Turkey.
For tours on my own bike I wear a black Belstaff.
The French were trying to make it compulsory to wear hi-viz, but I think that's been scrapped now.
If it came to court, the "I didn't see him" excuse obviously wouldn't work if you're wearing hi-viz.