It's not a jacket, but is worth considering. I rode with some guys on the big Kawasaki touring bikes. The top box from the rear covered up everything but their helmets. The lead guy had a hi-vis yellow helmet. I could spot him a long ways away, even from the rear. I was telling myself that if I ever replaced my trusty Nolan N-102, it would be with one like his.

We stopped for a break at a lake with a gravel parking lot. My helmet was sitting on top of my top box...and fell...face down...into the sharp gravel. The visor was chewed up, and one piece for the hinge area blew off on the ride home. I went out and bought a Scorpion EXO-900 helmet in hi-vis yellow that afternoon.

Chris

The police bikers here wear bright orangey-red helmets and can be seen for miles.