A bum roll is a necessary undergarment for 18th-century women. These are worn over the stays and under the petticoat on the backside. Tie the cotton tape around your waist then put on your petticoat. This crescent shaped support adds just a bit of lift to the skirts without the dramatic change of a larger support. Fashion meets function when not only do you achieve a more accurate drape of your outfit, this keeps petticoats from getting tangled up!