Green’s Dictionary of Slang

1. (also dandisette, dandizette, dandyzette) a female dandy; also attrib.

1819		T. Tegg Dandies and Dandizettes dressing for the Easter Ball [cartoon title].
1821		New Monthly Mag. I 409: The city dandy and dandisette, arrayed in the very newest of their septenary fashions.
1823		‘Jon Bee’ Dict. of the Turf, the Ring, the Chase, etc. 63: Dandyzette — feminine of the preceding: her characteristics were, a large poked bonnet, short petticoats much flounced, and paint. When she walked she kept the step with her Dandy, as if they had been drilled together in Birdcage-walk.
1825		Oxberry’s Dramatic Biography II 86: Windham’s sweet Phil appears — Mrs Brown’s thrilling dears, / Dandy-zette milliners, come to eclipse.
1890		Daily News 16 Sept. 4/7: The humours of the Dandies and the Dandizettes are shown up [...] in these pleasant pages [OED].

2. (US) a lesbian.

1966		Trimble 5000 Adult Sex Words and Phrases 59: dandysette (Sl.) A lesbian; a female Homosexual.
1972		B. Rodgers Queens’ Vernacular 70: any gay woman [...] dandysette (rare, hetero sl, ’40s).
1982		Maledicta VI:1+2 (Summer/Winter) 133: Here are some obsolete or nearly obsolete terms which careless lexicographers continue to list as current […] dandysette.