bustle

A bustle is a framework or padding placed around the back of a woman's dress or skirt, especially popular in the late 19th century, to support and shape the fabric into a fuller, more fashionable silhouette. It creates volume and lift at the back, emphasizing the waist and hips, and was used to accentuate one's figure and fashionable style of that era. In modern contexts, "bustle" can also refer to busy activity or lively movement in a location or event.