fig-leaf, n. — Green’s Dictionary of Slang

fig-leaf n.

an apron [it covers the same area as the biblical fig-leaves employed by Adam and Eve].

1705–07		N. Ward Hudibras Redivivus I:11 26: She underneath and he on top, / His Breeches down, her Fig-leaf up.
1873		Sl. Dict. 162: Fig-leaf a small apron worn by ladies.
1890–1904		Farmer & Henley Sl. and Its Analogues.
1895		Crowe Aus. Sl. Dict. 28: Fig-leaf, a small apron worn by ladies.

In derivatives

fig-leafer (n.)

a female performer who reveals a great deal of flesh.

1894

Mirror of Life 10 Feb. 7/1: The American Columbine is, however, coming nearer and nearer [...] to being a ‘fig leafer.’ She attracts more by what she shows of herself than by what she does.