My hat size is 7 3/8. I just discovered that my brother, the venerable Billdo also has a 7 3/8 head. IMHO, he’s kinda big-headed, ya know? Therefore, I have to conclude that I must have a giant head, because he’s a lot bigger and taller than me, and he’s male. (Do men have bigger heads than women? I always thought so, but I could be wrong.)
So anyway, what’s your hat size?