I'm searching eBay for a vintage hat. My head comfortably measures 22 5/8th inches where my hat would sit. Here is the problem! Some charts say 7 1/8th some say 7 1/4 some don't list the 5/8th and go straight to 3/4 with a total different hat size. There are so many charts to use I'm confused. What should I do about my hat size and vintage hats?