petticoat

2. A woman's or girl's underskirt, often with ruffles or lace, worn for warmth or to give shape.

The dancer's petticoat peeked out from beneath her twirling skirt.

3. A skirt-like part of a garment, such as the lower section of a coat or jacket.

The old coat had a torn petticoat hanging below the waist.

4. Historically, a loose garment worn by women as an outer skirt or under a gown.

In the 1800s, a petticoat was a common part of everyday dress.