Capes were common in medieval Europe, especially when combined with a hood in the chaperon, and have had periodic returns to fashion, for example, in nineteenth-century Europe. Roman Catholic clergy wear a type of cape known as a ferraiolo, which is worn for formal events outside of a liturgical context. The cope is a liturgical vestment in the form of a cape. Capes are often highly decorated with elaborate embroidery. Capes remain in regular use as rain wear in various military units and police forces, for example in France. A gas cape was a voluminous military garment designed to give rain protection to someone wearing the bulky gas masks used in twentieth century wars.