"What type of garb would you wear on this kind of bike? What comes to mind is goggles, brown or black leather bomber jacket (depending on the bike color) and a long scarf!"Belstaff Waxed Cotton (jacket and overtrousers and mitts!). Possibly full length gaberdine trench coat. Goggles - if you like. Bomber jacket - no, No, NO! Wrong period, wrong sub-culture. SHORT white silk scarf - if you like, but really only if a cafe racer model. And if you want the true period appearance....smoking a pipe while you ride (that's why designed to go quite sedately!
I ran across some lids and goggles while looking at Enfield inventory on this dealers page...http://store.uncommonmotorcycles.com/davida-helmets.html