By A Mystery Man Writer
A military hat called a “Chapeau-bras”—French for a folding hat that can be carried under the arm—which was worn by New York State Militia officer Jacob DeForest when he was the inspector of the Militia’s 11th Brigade before the Civil War. He later went on to serve as a Colonel in the 81st New York Volunteer Infantry, a regiment from Oswego, during the Civil War. This is typical of pre-Civil War militia uniforms.
BICORNE HAT - Stock Photos, Illustrations and Images - Album
Hats, Caps, and Chapeaux - USS Constitution Museum
PRE-CIVIL WAR, GENERAL OFFICER, M1859, CHAPEAU De BRAS, WITH PROVENANCE, RARE! – Hausa Christian Foundation
US Navy, Undress Chapeau Bras, Officer [10-490] : Historical Twist Store, Museum Quality
Military chapeau hi-res stock photography and images - Alamy
Accessories for the Regency Gentleman - GBACG - the Greater Bay Area Costumers Guild
US, Undress Chapeau Bras, Officer [10-140] : Historical Twist Store, Museum Quality
Original U.S. 1840s Army Officer Chapeau-Bras Bicorn Hat by W.H. Horst – International Military Antiques
List of headgear - Wikipedia