Every time I go to a bar in America - half if not more of the attendees are wearing a hat. Backwards snapbacks or baseball caps (backwards and forwards).
It’s mostly the men. I thought it was to cover baldness but a lot of what I see has full set of hair. Is it an alpha American thing or a cool sports thing?
Hats keep you cool in the summer and warm in the winter. They prevent hair from falling into your food. They can accessorize your clothing and declare your team allegiance.