Underskirt

[Zipporah Schumaker]

A petticoat; the foundation skirt of a draped dress.

[Sonia]

A slip is a womans [undergarment] worn beneath a dress or skirt to help it hang smoothly and to prevent [chafing] of the skin from coarse [fabrics] such as wool. Slips are also worn for warmth, and to protect fine fabrics from perspiration.

[Magaret]

A skirt worn under another; a petticoat.