Green’s Dictionary of Slang

(UK Und.) a wig.

c.1698		B.E. Dict. Canting Crew n.p.: Scandalous c. a Periwig.
1725		New Canting Dict. n.p.: scandalous a sorry Perriwig.
1737, 1759, 1760, 1776		Bailey Universal Etym. Eng. Dict. [as cit. 1725].
1785, 1788, 1796		Grose Classical Dict. of the Vulgar Tongue.
1809		G. Andrewes Dict. Sl. and Cant.