Girl Wearing A Skirt

During the nineteenth century the cut of women's dresses in western culture varied more widely than in any other century. Waistlines started just below the bust (the Empire silhouette) and gradually sank to the natural waist. Skirts started fairly narrow and increased dramatically to the hoopskirt and crinoline-supported styles of the 1860s; then fullness was draped and drawn to the back by means of bustles.
Skirts in the 20th and 21st centuries
Beginning around 1915, hemlines for daytime dresses left the floor for good. For the next fifty years fashionable skirts became short (1920s). then long (1930s), then shorter (the War Years with their restrictions on fabric), then long (the "New Look"), then shortest of all from 1967 to 1970, when skirts became as short as possible while avoiding exposure of underwear, which was considered taboo.
Since the 1970s and the rise of pants for women as an option for all but the most formal of occasions, not one skirt length has dominated fashion for long, with short and ankle-length styles often appearing side-by-side in fashion magazines and catalogs.