According to wikipedia, capri pants (also known as three quarter legs, capris, crop pants, man-pris, clam-diggers, flood pants, jams, highwaters, or toreador pants) are pants that are longer than shorts but are not as long as trousers. Capri pants can be a generic term for any cropped slim pants, and also used as a specific term to refer to pants that end on the ankle bone.
Capri pants were introduced by fashion designer Sonja de Lennart in 1948, and were popularised by her and English couturier Bunny Roger. The name of the pants is derived from the Italian isle of Capri, where they rose to popularity in the late 1950s and early '60s. The actress Audrey Hepburn was among the first movie stars who wore Capris, and the pants quickly became synonymous with her classic style.
Capri pants has since become a style staple for icons like Grace Kelly to Jackie Kennedy Onassis, and Brigitte Bardot and Marilyn Monore, but nobody is like Audrey Hepburn, that is more associated to capri pants. She is so iconically connected to this outfit that the capri pants could be renamed as Audrey pants.