Chaperon Medieval Velvet Headgear with Liripipe. 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 called a liripipe, and then developed into a complex, versatile and expensive headgear.
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. (Wikipedia)