A light woman's undergarment worn under a dress or skirt, and hanging either from the shoulders or (now especially) from the waist; a kind of slip, worn to make the skirt fuller, or for extra warmth
A petticoat is a piece of clothing like a thin skirt, which is worn under a skirt or dress. a piece of women's underwear like a thin skirt or dress that is worn under a skirt or dress = slip (petty + coat)
{i} slip that is worn under a dress; underskirt, slip worn under a skirt; (USA) something that looks like a skirt (such as a valance); (Offending term) woman, girl
Ancestor of the modern slip, the petticoat could be made of a variety of fabrics Since nylon wasn't invented yet, both linen and wool were common These were ankle-length and fastened at the waist with a drawstring or waistband Any number from one to seven could be worn depending on the social status of the individual