[UNDER-1 5 a.] A skirt worn under another, a petticoat; also, a foundation over which drapery or an overskirt is disposed.

1

1861.  Mrs. Riddell, City & Suburb (1862), 90 (H.). She … affected flounces and many petticoats, wearing as many as eight or ten underskirts.

2

1883, 1884.  [see OVERSKIRT].

3

1907.  H. Wyndham, Flare of Footlights, xix. Nearly all the latter … displayed a greater amount of silk underskirt than seemed altogether necessary.

4