Chaperon (/ˈʃæpəroʊn/ or /ˈʃæpərɒn/; Middle French: chaperon) was a form of hood or, later, highly versatile hat worn in all parts of Western Europe in the Middle Ages. Initially a utilitarian garment, it first grew a long partly decorative tail behind called a liripipe, and then developed into a complex, versatile and expensive headgear after what was originally the vertical opening for the face began to be used as a horizontal opening for the head. It was especially fashionable in mid-15th century Burgundy, before gradually falling out of fashion in the late 15th century and returning to its utilitarian status. It is the most commonly worn male headgear in Early Netherlandish painting, but its complicated construction is often misunderstood.
The chaperon began before 1200 as a hood with a short cape, put on by pulling over the head, or fastening at the front. The hood could be pulled off the head to hang behind, leaving the short cape round the neck and shoulders. The edge of the cape was often trimmed, cut or scalloped for decorative effect. There were wool ones, used in cold weather, and lighter ones for summer. In this form it continued through to the end of the Middle Ages, worn by the lower classes, often by women as well as men, and especially in Northern Europe. The hood was loose at the back, and sometimes ended in a tail that came to a point.
Chaperon is a diminutive of chape, which derives, like the English cap, cape and cope, from the Late Latin cappa, which already could mean cap, cape or hood (OED).