Interesting thread Fred. Not sure what you'd like to accomplish with it, but in your terms, if you convince even one rider to switch to hi-viz gear, you've possibly improved one rider's safety margin.
Sorry, I don't have a published study to share, but I do have a couple of things for you to consider. I rode with hi-viz for about 18 months when I got back into riding in '03, including the period when I got my FJR. After one too many incidents with police officers that responded to my question of why they choose to pull me over, out of a group of motorists all traveling at the same speed, with "your yellow jacket stood out more", I changed to black. Most of the officers admitted that all the other motorists were just as guilty as I was, and I was never the lead motorist, but essentially said that because my hi-viz gear caught their attention, they selected me for the traffic stop. Only one jerk flat out said "because I hate motorcyclists". I've been stopped on the bike once since then, in the following 8+ years of riding. (200k miles)
Pre-internet, in the early '80's CalTrans did a study, (which I can't find any internet reference to), where they got a group of drivers that had been involved in car/motorcycle accidents to under go hypnosis. All of these drivers said the same thing after the accident, "I never saw the rider". But, under hypnosis, every single one admitted to seeing the motorcyclist, then ignoring them. The study concluded that the drivers subconscious mind was aware of the rider, but did not see it as a threat, so dismissed it as important information, before the conscious mind ever recognized it. A motorcycle will not usually threaten someone in a 3000 lb steel cage, all by itself.
In that same period of time I was riding on and off base. On base we were required to wear a hi-viz safety vest, but off base we didn't have to. When this started, I wore the vest all the time and had quite a few near misses off base. Then one day I forgot to put it on after stopping at a friends house and rode back to base w/o the vest, figuring I would stop before the gate and put it on. I noticed an odd thing, people gave me more space w/o the vest. Often a lot more. With the vest people were always crowding me and lane splitting was more difficult and just at intersections people would stop closer to me than w/o the vest.
Eventually I figured out the phenomenon. In black leather, I was a "biker" and therefor a threat. In hi-viz, I was a "motorcyclist" and therefor not a threat, so safe to ignore/crowd/cut off, etc. I actually heard people in cars say things like "don't get too close to the biker" when wearing black leather. I was riding a '79 Honda CX-500, so not anything a rider would take as a hard core biker.
I don't see anything wrong with wearing hi-viz. But I don't wear it because my experience is that if I am perceived as a threat, mostly because they think I'm a cop now days, then I am noticed more. Black jacket, white helmet, funny looking big bike with odd reflective stickers on the back and something most can't identify, (fuel cell), plus CB antenna and I get noticed a lot by drivers. Cops here and the PacNorWet don't wear hi-viz, though I am starting to see some of it lately.
Yep, anecdotal stuff. I'm not rationalizing my choice, I choose to ride w/o hi-viz because I feel it makes me more noticed. As far as the fashion aspect, I couldn't care less what color things are. Form follows function for me. I just bought a new jacket and it's gray, mostly because darker colors are hotter in the sun, so I'm taking the small margin that a lighter color may offer and going to try that and see if it's significant. It will be interesting to see if this negatively impacts people noticing me or not.
Riding the FJR with black gear and a white helmet I got a lot of 'cop effect' and even did a couple of traffic stops where the people I pulled over believed I was a cop. These were incidents where safety issues were going on an the drivers were oblivious. Trailer tire on fire & loose load on trailer. I just put the flashers on, got in front of them and did my best impression of the old Chips show with the arm pump motion to pull to the side of the road while slowing down. I never claimed to be a LEO, but the maneuver effectively got their attention and they pulled over.
And remember, it doesn't matter if they don't see us, WE SEE THEM. It's our responsibility to see the idiots and take action. You can't expect them to ever do the right thing or even the predictable thing.