Green’s Dictionary of Slang

1. a peruke or wig.

c.1698		B.E. Dict. Canting Crew n.p.: Periwinkle a Perruque or Periwig, also the same as Pinpatches.
1725		New Canting Dict. [as cit. c.1698].
1737, 1759, 1760, 1776		Bailey Universal Etym. Eng. Dict. [as cit. c.1698].
c.1750–1882		B.M. Carew Life and Adventures.
1785, 1788, 1796		Grose Classical Dict. of the Vulgar Tongue n.p.: Perriwinkle, a wig.
1809		G. Andrewes Dict. Sl. and Cant.
1811		Lex. Balatronicum [as cit. 1785].
1823		Egan Grose’s Classical Dict. of the Vulgar Tongue.

2. a small penis.

1837–8

‘The Periwinkle’ in Cuckold’s Nest 7: Ralph, the ploughman, who’s so strong, / Showed me one nearly ten inches long! [...] No true love can pass between us, / For I never, I swear, can consent, I declare, / To have a periwinkle instead of a --- Wickey icky, &c.

3. the vagina.

1890–1904

Farmer & Henley Sl. and Its Analogues.