Most motorcyclists wear leather jackets, and leather jackets are almost always black.
That being said, military personnel are required to wear a reflective vest when riding on base. Military bases typically have a 12,000 foot runway, so the road that parallels it is over two miles long.
When I was in the Navy, I brought my Kevlar faired HPV on base, and it was so darned camoflaged, it was declared "invisible" , even though I ran 12 volt lights. I had to wear a reflective vest while riding it on base.
I would say that black leather jackets go with the Harley ,
and colored leathers go with the Japanese bikes, in general.
A friend of mine has a 2002 Suzuki Hyabusa and he works for the DPW (Department of Public Works).
He wears his county issued reflective vest while riding, and he insists that the color of the reflective tape is "Strong Yellow-Green", and NOT lime green. A new law in New York declares silver reflective tape "for road-cones only" he says.