What is trilby hat?

Trilby hat is a type of men's hat with a narrow brim and an indented crown, typically made of wool felt or straw. It derives its name from the novel "Trilby" (1894) by George du Maurier, which featured a character named Trilby O'Ferrall who wore a similar hat. The trilby is often associated with British and American fashion, particularly in the 20th century. It is commonly worn with casual and semi-formal attire, such as tweed jackets, dress pants, and jeans. The trilby became increasingly popular in the mid-2000s as a fashion accessory among young adults.