[UNDER-1 5 a.] A skirt worn under another, a petticoat; also, a foundation over which drapery or an overskirt is disposed.
1861. Mrs. Riddell, City & Suburb (1862), 90 (H.). She affected flounces and many petticoats, wearing as many as eight or ten underskirts.
1883, 1884. [see OVERSKIRT].
1907. H. Wyndham, Flare of Footlights, xix. Nearly all the latter displayed a greater amount of silk underskirt than seemed altogether necessary.