Girl Wearing A Skirt

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.