Slouch hat

A slouch hat is a wide-brimmed felt or cloth hat most commonly worn as part of a military uniform, often, although not always, with a chinstrap. It has been worn by military personnel from many different nations including Australia, Britain, India, New Zealand, Southern Rhodesia, France, the United States, the Confederate States, Germany and many others. Australia has had a slouch hat as standard issue headwear since the late Victorian era.

Today it is worn by military personnel from a number of countries, although it is primarily associated with Australia, where it is considered to be a national symbol. The distinctive Australian slouch hat, sometimes called an "Australian bush hat" or "digger hat", has one side of the brim turned up or pinned to the side of the hat with a Rising Sun Badge in order to allow a rifle to be slung over the shoulder.

In the United States it was also called the Kossuth hat, after Lajos Kossuth. During the American Civil War (1861–65) the headgear was common among both Confederate and Union troops in the Western Theater, although not always with its brim turned up at the side. During the Spanish–American War, as commander of the Rough Riders, Colonel Theodore Roosevelt became known for wearing a slouch hat.

The name "slouch hat" refers to the fact that one side droops down as opposed to the other which is pinned against the side of the crown. This style of hat has been worn for many hundreds of years, especially during the English Civil War during the 17th century when it became associated with the forces of King Charles I, the Cavaliers, but it was also fashionable for the aristocracy throughout Europe during that time until it was superseded by the cocked hat which has been referred to as the tricorn or bicorn depending upon the number of points.

...
Wikipedia