A marker is a type of schematic plan that places various pattern pieces of a garment or other item in the best possible position for cutting and to achieve the best possible yield. Various sizes are integrated according to the quantity needed. A person can do this by hand on paper or by computer. The marker is then placed on top of several layers of fabric and then cut.
Historical Dictionary of the Fashion Industry. Francesca Sterlacci and Joanne Arbuckle.