… petticoats with and without trains. Each had a specific way of lifting the skirt. Some were stiffer to lift up heavy fabrics like wool or linen, while most were fairly light in weight using just layers of ruffles or thin twisting strips of horsehair in cotton (a “tournure” in French) to give a light support. Most just used a rump pad much like had been used in the 18th century to make rear ends look bigger.
(Shown: ruffled petticoat and supportive tournure)