HOW TO MEASURE YOUR HEAD
1. To determine your head size, get a tape measure and put it around your head.
2. Place it where you want your hat to rest.
3. If you have a hat that fits well, put it on. Look and feel where it rests. Measure in that same spot. Usually, that is just above the center of the forehead in front, and on the upslope of the “lump” in back.
4. The tape should be above the tops of your ears on both sides. Most people like their hats to rest anywhere from one-eighth to one-half inch above the ears. Be sure to measure where you want your hat to rest. Check the tape to make sure it’s more or less level all around.
Pull the tape snug and see if it feels right. If not, try a little higher and a little lower until it feels just right.
5. Once you’ve found your spot, measure to the nearest one-eighth inch, or one-fourth centimeter. You may want to use a piece of tape to hold the band to that size, then take it off and put it on a couple of times to see if that’s the right size for you.
If it easily comes down below the tops of your ears, then it is too big. You want it snug. Very snug.
6. Once you decide on a measurement, write it down before you forget. What is the “correct” hat fit? Whatever feels right to you. There is no “correct” hat size for you. It is entirely a matter of personal preference. My own personal hats are not all the same size. A tighter-fitting hat stays on better when the trade winds gust. A looser-fitting hat is more comfortable. Some people like ’em high and tight, others lower and looser. It’s totally personal, totally up to you.