Skirt hemlines should fall below the knee and the shoulders should always be covered. The space age look was defined by boxy shapes, thigh length hemlines and bold accessories. A main reason for this was the trend towards higher hemlines on dresses (see minidress). The theory suggests that hemlines on women's dresses rise along with stock prices. Waistlines for women were left unmarked and hemlines were getting shorter and shorter. Beginning around 1915, hemlines for daytime dresses left the floor for good. Rising hemlines made longer styles of boots popular. Certainly this lengthening of hemlines coincided with the growth of the feminist movement. Hemlines were below the knee or longer. By the mid-1960s, the hemlines rose and the clothes loosened, influenced by the mod culture. Modern stockings became popular in the 1920s with the rise in women's hemlines. Hemlines kept rising, and by 1968 they had reached well above mid-thigh. The hemlines varied from midi to ankle-length. The hemlines varied from knee-length to floor-length. Beginning in the 1970s, the hemlines dropped back to the ankle.