Knife-edge pleats consist of folds on evenly spaced, marked lines that all fold in the same direction. The distance between the marked lines is called the pleat depth. For knife-edge pleats, with fabric right side up, fold first marked line over to meet with second-marked line. Repeat for remaining pleats, making sure all pleats fold in the same direction. Baste across top of all pleats to secure. If desired, topstitch each pleat close to folded edge, ending all topstitching the same distance from the waistline edge. A single pleat in the front or the rear centre of a skirt is called a golf pleat.