SUGGESTED MARGINS WHEN MEASURING FOR YOUR STETSON
YOU WANT THE LARGEST PART OF THE HEAD.
1)   USING A SOFT MEASURING TAPE, START BETWEEN THE EYEBROWS WITH APPROXIMATLY ½ INCH ABOVE THE BROW BONE.
2)   THE MARGIN ABOVE THE TIP OF EACH EAR SHOULD ALSO BE APPROXIMATLY ½ INCH.
3)   THE TAPE SHOULD GO DIRECTLY OVER THE PEAK OF THE LARGE “BUMP” IN THE BACK OF THE HEAD.
4)   WHEN THE MEASURING TAPE IS AROUND YOUR HEAD, YOU WANT IT TO FEEL LIKE YOU HAVE YOUR STETSON ON. THIS IS WHERE, AND HOW SNUG, YOU WANT YOUR STETSON TO FIT.

THE STETSON IS AUTHORIZED HEAD WEAR.  NOT REGULATED.  BUT CHECK WITH YOUR UNIT.  THEY MAY HAVE GUIDELINES FOR HOW THEY WEAR THE STETSON.