Bicorne or cocked hat of the Revolutionary and Napoleonic Wars. Many different patterns for most armies are available, in both private and officer versions. Specifically, French patterns 1786, 1791 and 1801 can be made. Also Imperial Guard patterns for privates, NCOs and officers (folding-up patterns).
In the photos some original extant specimens and a few of the hats I made.
Available in standard hat sizes (see chart).