Green’s Dictionary of Slang

1. (also unbreech) to strip someone of their clothes; thus unrigged adj., stripped.

c.1698		B.E. Dict. Canting Crew n.p.: Unrig the Drab, c. to pull all the Whore’s Cloths off.
1725		New Canting Dict. [as cit. c.1698].
1737, 1759, 1760, 1776		Bailey Universal Etym. Eng. Dict. [as cit. c.1698].
1785, 1788, 1796		Grose Classical Dict. of the Vulgar Tongue.
a.1790		H.T. Potter New Dict. Cant (1795) n.p.: unrigg’d, or unbreeched stript naked and lost all his money.
1809		G. Andrewes Dict. Sl. and Cant.
1811		Lex. Balatronicum.
1823		Egan Grose’s Classical Dict. of the Vulgar Tongue.

2. to get undressed.

1682		‘On Three Late Marriages’ in Wilson Court Satires of the Restoration (1976) 77: Now cully Arundal has lost his whore, / And bully Chevens must unrig no more.
1693		Congreve Old Bachelor V i: bell: I would unrig. set: I attend you sir.
c.1698		B.E. Dict. Canting Crew n.p.: Unrig’d, Stript, Undrest.
1725		New Canting Dict. [as cit. c.1698].
1737, 1759, 1760, 1776		Bailey Universal Etym. Eng. Dict. [as cit. c.1698].
a.1790		H.T. Potter New Dict. Cant (1795).
c.1800		‘The Tar’s Frolick’ in Holloway & Black I (1975) 260: I quickly unrigg’d, and jumped into bed.
1805		J. Davis Post Captain (1813) 63: You are as long rigging and unrigging as a seventy-four gun ship.
1835		G. Kent Modern Flash Dict. 34: Unrigged – stripped of money and clothes.
1848		Flash Dict. in Sinks of London Laid Open [as cit. 1835].