The tricorne or tricorn is a style of hat that was popular during the 18th century, falling out of style by 1800, though actually not called a "Tricorne" until the mid 1800's. During the 18th century hats of this general style were referred to as "Cocked Hats". At the peak of its popularity, the Cocked Hat (tricorne) varried greatly in style and size, and was worn not only by the aristocracy, but also as common civilian dress, and as part of military and naval uniforms. Typically made of animal fiber, the more expensive being Beaver Hair Felt and the less expensive being constructed of Wool Felt. The hat's most distinguishing characteristic being that three sides of the brim were turned up (cocked) and either pinned, laced, or buttoned in place forming a triangle around the crown. The style served two purposes; first allowing stylish gentlemen to show off the most current fashions of their wigs, and thus their social status. Secondly, the cocked hat, with it's folded brim was a much smaller hat and more easily tucked under an arm when going inside a building, where social etiquette dictated that a gentleman remove his hat. It should be noted that Cocked hats with laced sides could have the laces loosened and the sides dropped down to provide better protection from the weather, sun and rain.  
The tricornes had a rather broad brim, pinned up on either side of the head and at the back, producing a triangular shape. The hat was typically worn with the point facing forward, though it was not at all unusual for soldiers, who would often rest a rifle or musket on their left shoulder, to wear the tricorne pointed above their left eyebrow to allow better clearance. The crown is low, unlike the steeple hats worn by the Puritans or the top hat of the 19th century.
Tricornes ranged from the very simple and cheap to the extravagant, occasionally incorporating gold or silver lace trimming and feathers. In addition, military and naval versions usually bore a cockade or other national emblem at the front.
The tricorn appeared as a result of the evolution of the broad brim round hat used by Spanish soldiers in Flanders during the 17th century. By pledging (binding) the brims, a triangular shape was obtained. This shape was favored by Spanish soldiers and in 1667, war broke out between France and Spain in the Spanish Netherlands. During the subsequent military struggle, its use spread to the French armies. The style was brought back to France, where its usage spread to the French population and the royal court of King Louis XIV, who made it fashionable throughout Europe, both as a civilian and military wear. By the end of the 17th century, the tricorne was popular in both civilian fashion and in military uniforms. They remained one of the predominant European styles of hat throughout the 18th century. In the United States, only the first five Presidents, from George Washington to James Monroe, wore this style of hat according to the fashion of the 18th century. James Monroe gained the nickname "The Last Cocked Hat" because of this.
The tricorne quickly declined in use at the end of the 18th century. It evolved into the bicorne, which was widely used by military officers in Europe from the 1790s until World War I, not completely fading out of style until World War II. For enlisted soldiers, the tricorne was replaced by the shako at the turn of the 19th century, which had become the new dominant style of military headgear from 1800 on. As the fashionable hat for civilian men, the tricorne was overtaken by the top hat.
Modern usage and legacy
Tricornes survive today as part of the traditional dress of the Chelsea Pensioners (UK) and the Old Guard Fife and Drum Corps of the United States Army., and the distinctive hat of the Guardia Civil (Spain), called a tricornio in Spanish, originates from the tricorne. A black feathered tricorne is worn by the Lord Mayor of the City of London for all ceremonials and is in evidence at the annual Lord Mayor's Show in November, when the newly elected Lord Mayor enthusiastically waves it at the crowds. The Lord Chancellor and the Speaker of the House of Commons are also traditionally entitled to wear or carry it when wearing state robes with full bottomed wigs at state occasions (and, in theory, the Lord Speaker is also entitled to do so as well).
In the United States, the tricorne is associated with the American Revolution and American Patriots of that era, especially Minutemen (militia members of the American Colonies). Participants in reenactment events often don tricornes, and they also can be seen in sports culture as worn by fans of teams with Revolutionary names, such as the New England Patriots (an American football team), the New England Revolution (a Major League Soccer team), the United States men's national soccer team, the University of Massachusetts Amherst, and the George Washington University. Voters associating themselves with the Tea Party movement use the tricorne as an icon to associate themselves with the patriots of the American Revolution, and their distaste for big government and excessive taxation.
In France, synagogue officiants (usually not rabbis), wear the tricorne on formal occasions. In the French navy and air force, tricorn are still worn by women as a piece of uniform.
The tricorne is a key feature in the University of Minho's academic dress, in Portugal. Its origins are as far as 18th century, as being the academic dress of Colégio de Estudos Superiores de S. Paulo, as depicted by tile panels in the Archbishop's Palace of Braga (now Rectorate of the University of Minho). Designated by "Tricórnio" (Portuguese for "tricorne"), this academic dress was redesigned and officially set 1989.
A folk song, to the tune of Carnival of Venice (song), goes, ‘My hat it has three corners, three corners has my hat; and had it not three corners, it would not be my hat.’ The song is usually sung several times in a row, each time omitting a specific word and replacing it with a gesture representing it (for instance, pointing at one’s elbow whenever the word ‘corners’ is sung) and mouthing the omitted word.
Figure of Louis XIV c. 1685
Charles Alexander, c. 1733–1737
Thomas Gage in 1743
Frederick the Great wearing a tricorne, c. 1750
Catherine the Great, c. 1760
Charles III of Spain, c. 1786–88
Chelsea pensioners in tricornes
- Gentlemen of Fortune
- Hats from the past till the present and their production (in Czech)
- Castells, Albert. "Los tercios viejos y la presencia española en Flandes", Espasa, Madrid, 1997
- Digital History, Steven Mintz. "Digital History". Digitalhistory.uh.edu. Retrieved April 20, 2010.
- Real Life at the White House: 200 ... – Google Knihy. Books.google.cz. Retrieved April 20, 2010.
- Cocked Hat – Infoplease.com
- The Royal Hospital Chelsea
- Old Guard Fife and Drum Corps
- Lord Mayor's Show
- American Headgear of the Revolutionary War
- New England Patriots
- New England Revolution
- University of Massachusetts Amherst – Official Athletic Site