What is originally, a napkin; later, an ornamental band or scarf worn upon the left arm as a part of the vestments of a priest in the Roman Catholic Church. It is sometimes worn in the English Church service called?

maniple — Originally, a napkin; later, an ornamental band or scarf worn upon the left arm as a part of the vestments of a priest in the Roman Catholic Church. It is sometimes worn in the English Church service. (Webster's 1913.)