Up until the 20th century, hats played an incredibly important role in fashion and attire – arguably much moreso than today. In the 19th century, felt was a common material for hats, and Felt Hat Day encourages us all to don a felt hat in tribute to this historically significant, but now somewhat neglected accessory.
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All details taken directly from provider content at http://www.daysoftheyear.com/days/felt-hat-day/