what is the difference between a derby and bowler hat
The bowler, not the cowboy hat or sombrero, was the most popular hat in the American West, prompting Lucius Beebe to call it "the hat that won the West". Both cowboys and railroad workers preferred the hat because it would not blow off easily in strong wind while riding a horse, or when sticking one's head out the window of a speeding train. It was worn by both lawmen and outlaws, including Bat Masterson, Butch Cassidy, Black Bart, and Billy the Kid. In the United States the hat came to be known commonly as the derby, and American outlaw Marion Hedgepeth was commonly referred to as "the Derby Kid".