Balenciaga "sack dress", black wool crepe, 1957. This loose, comfortable dress contrasted with the fitted silhouette more common at the time. The “barrel” line, so defined by the master, appeared in 1947. From that time on, Balenciaga experimented with the loose-fitting backs of his garments, creating the tunic dress in 1955 and the sack dress in 1957. He reinterpreted the female shape and eliminated the waist, creating silhouettes that were completely new in the history of fashion.