Yeah I think that would be a good idea. I HAVE measurements of my head but they're without the arming cap I newly got so I guess I need to take new ones. Still nagging my parents about it but they always put it off as if it's "not important". The arming cap does fit my coif better than the padded coif I got so I guess getting that was a waste. I've gone through about 4 arming caps so far because none of them fit properly but my current one I prefer as it's padded just the right amount, just have to dye it black to fit the rest of my clothes. Personally I wish I got a natural color gambeson but black did exist in the 1200s just NOT for leather, for clothing yes it did exist.