Here's a cautionary tale:
I bought this helmet online recently. The price was great and the ad said it was SCA legal and would fit an average sized person.
This helmet was custom made for me many years earlier. The guy who made it fitted each piece to my head after he shaped it and before he put the pieces together.
I have an average size head, so I guesed the fit would be similar on the two helmets.
I was wrong. The picture I took above was taken at a deceptive angle.
Even with the helmets side by side, can anybody point out all the things wrong with the fit on my new helmet? I've seen nothing to show me the helmet isn't legal, if I could just find somebody for whom the helmet fit.