Mourning clothes of a peculiar fashion, denoting her state. A grass widow; a discarded mistress. a widow bewitched; a woman whose husband is abroad, and said, but not certainly known, to be dead.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Wicket * WifeNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes