Green’s Dictionary of Slang

chorus man n.

also chorus moll, ...queen
[negative stereotyping]

(US) an effeminate, poss. homosexual man.

1925
193019401950196019701980
1984
[US]G.H. Mullin Adventures of a Scholar Tramp 305: Can you imagine? Me sashurated with smell-’em-good all the time like a damned chorus-man.
[US]Wood & Goddard Dict. Amer. Sl. 16: fagot. A chorus man; an effeminate man.
[US]‘R. Scully’ A Scarlet Pansy 184: ‘Why Minnie,’ shrieked one [i.e. chorus boy], ‘I didn’t know you loved chorus molls. I’ll have to get my panties pleated and begin my daily exercises with a lipstick and eyebrow pencil.
[UK]Kirck & Heath Men in Frocks 18/2: [I]n the Panto Dame tradition of ‘cod’ drag, [...] the presumption is that there is something amusing about men dressing in women’s clothes, and there is no real attempt to delude. [...] Not so our Chorus Queens—they were there to look lovely [Simes:DLSS].