florence, n. — Green’s Dictionary of Slang

florence n.

[Northants. dial. florence, one who dresses untidily; whether this comes from the proper name and thus memorializes a long-forgotten woman is unknown; Williams prefers a link to the prostitutes of Florence, Italy, and their speciality, the Florentine kiss, synon. with a French kiss]

an untidily dressed young woman.

c.1698		B.E. Dict. Canting Crew n.p.: Florence, a Wench that is touz’d and ruffled.
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.