I agree, noise from headwear is a real pain, @dlearl476. I know, I have sensitive ears. "Ah, diddums" I hear you say. But at least I hear you say it from 200 yards. ;-)
Anyway, going back to biker references, it's all about wind noise which is often caused by gaps and aerodynamics, hence open face helmets can sometimes be quieter in use than full-face helmets.
@Gordon Nichols as for most suitable headgear, I refer back to my previous post of a Stirling Moss-style 'Corker-style' helmet as probably being the most suitable for a car of this era:
And of course the goggles and string-back gloves complete the ensemble. Oh, and throw in Dunlop-branded racing overalls. However, in cycling terminology, that would make me a FKW (Full Kit W*nker), so perhaps I'll settle for just a flat cap and sunglasses (or yellow driving glasses for night driving). I definitely need eye-protection in this car - the top of the screen intersects with my vision just below the horizon, so I look at traffic over the top and the road ahead through the screen.