Although the pork pie hat, sometimes known as the stingy brim hat, is most often associated with 1920s and 30s Britain, Buster Keaton and jazz-era America, this super stylish cap actually dates all the way back to the American Civil War. Pork pie hats are traditionally rounded hats with narrow, curled brims and partially domed crowns. A hallmark of high fashion and eccentricity, pork pie hats are most often finished with fun embellishments like feathers and patterned or striped bands.