"The bicorne or bicorn (two-cornered/horned or twihorn) is a historical form of hat widely adopted in the 1790s as an item of uniform by Europe and ...
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American army and naval officers. Most generals and staff officers of the Napoleonic period wore bicornes, which survived as widely-worn full-dress headdress until the 1910s." - (en.wikipedia.org 29.06.2021)