Do you think people who race historic cars should wear period racewear? I find they should, cos most of the drivers now are anachronisms, it's like a modern F1-pilot squeezed into a thoroughbred racing machine. Of course that might question the safety, but if you want safety you don't go racing an old car, instead opt for something new with well-thought safety features.
I'd find it cool to see racers dressed like they used to when you go to a historic race meeting.