Tricorn is the incorrect but modern popular term for a corned hat. A corned hat is a round brimmed hat with bent upwards in three points, and it's the most common hat style of the 18th century. In short, this thing:What is a tricorn hat?
The fancy round bow on the side is called a cockade, the color and style of which was used by colonial American to distinguish what type of military service or regiment they belonged to, instead of insignia on a uniform coat, which were not available to colonials until late in the revolution (rebellion). For soldiers, the hat was rotated 45 degrees to the side so the front peak of the hat won't be hit by your musket and knocked off your head during reloading. Those not involved in fighting with a firearm wore the hat as shown above.
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