September 15th is National Felt Hat Day! Today is the day, historically, that signals a shift in headwear based on the time of the year and the weather. By the early 1900s, short-brim straw hats, known as “boaters,” were considered acceptable day attire in cities at the height of summer. There was, however, an unwritten rule that one was not supposed to wear a straw hat past September 15. One should exchange their straw hat today for a felt hat until May 15 (National Straw Hat Day). In honor of