How to Determine Your Hat Size
Determining your hat size requires measuring around the head and across the forehead and converting the inches on a standard hat sizing chart. Find the correct hat size, which should be snug but not too tight, with fashion tips from the co-owner of a hip clothing store in this free video on men's apparel.
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How to determine your hat size. So, you wrap the tape measure straight across your head about half an inch above the brow line. So, he measures 22 1/2, which, according to the standard hat sizing chart he would be a size 7 1/8. So, this is a size 7 1/8 and when he puts in on, it should fill snug, but not tight. If you fill like it's going to leave a red line going across your forehead, it's too tight, size up. But, this looks about good, it should feel like it's not going to blow-off if the gust of wind comes, but again, not that tight, and that's how you determine your hat size.