Half-slip and Petticoat

Half-slip noun - Undergarment worn under a skirt.

Petticoat is a synonym for half-slip. In some cases you can use "Petticoat" instead a noun phrase "Half-slip".

Petticoat noun - Undergarment worn under a skirt.

Half-slip is a synonym for petticoat in slip topic. You can use "Half-slip" instead a noun "Petticoat", if it concerns topics such as underskirt.