Cha·peau n.; pl. Chapeux
1. A hat or covering for the head.
2. Her. A cap of maintenance. See Maintenance.
Chapeau bras , a hat so made that it can be compressed and carried under the arm without injury. Such hats were particularly worn on dress occasions by gentlemen in the 18th century. A chapeau bras is now worn in the United States army by general and staff officers.
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