I have never met a non-adjustable hat that fits me.

Hah! I have never met adjustable hat that fits me. I had to have my baseball caps (used when driving with Twingo's roof open) made to order! As for glasses, distance between centers of my pupils is 74mm (and, of course, 'ready to wear' eyewear is out of the question)!

I once worked on instrumentation on a desulphurization pilot plant in a coal-fired power plant. Hard hats were mandatory. I regret not having any photos of myself with the largest hard hat they had. It looked on my huge head like one of those little ritual caps Jews wear (what's the name of it, BTW?).