Green’s Dictionary of Slang

a widow’s head-dress, worn to signify her mourning state.

c.1698		B.E. Dict. Canting Crew.
1750–1882		B.M. Carew Life and Adventures n.p.: Bandero a widow’s mourning peak.
1785, 1788, 1796		Grose Classical Dict. of the Vulgar Tongue.
c.1850		Duncombe New and Improved Flash Dict. n.p.: Bandero a widow’s coif.
1859		Matsell Vocabulum 10: bandero A widow’s weeds.