The term 'bowler hats' is often used to refer to the type of hat known as a derby, which is a hard felt hat with a rounded crown and a narrow brim. The term 'DERBIES' is also used to refer to this type of hat, and it is made up of seven letters. Bowler hats were originally created in the mid-19th century in England and were popular among the working class. They have since become a fashion staple and are often seen in films and television shows.