How To Tell Your Hat Size. If your measurement falls between sizes, choose the next largest size. To be sure you have the best fit possible, don’t guess, measure your noggin’ and be sure.
Hats with inner drawstrings if your new hat is slightly large and feels a little loose, don’t worry. I don't want to guess and get the wrong fit. To find your hat size, take your ruler measurement and find the corresponding size on the chart.
Place the measuring tape at an edge of the brim and pull the tape up to the top of the hat.
A good way to test a hat’s fit is to simply use your finger — if you can fit one finger between your head and the cap then you know you have the right size. The band or frame size is the firm circumference, fitted not tightly, measured directly underneath the breasts. Usually, these charts will list the measurements in centimeters and inches. Tips on how to measure head size for women and men in order to determine the right hat size for you.