This thong (or t-back) has a contoured front seam with a thong back and no seat. It is a fairly easy garment to sew but requires some skill at sewing elastic. It is designed to be made without a lining (see sewing tips about swimwear lining). The pattern is made for waist sizes SMALL 28-30 inches (70-75 cm); MEDIUM 31-33 inches (77.5-82.5 cm); LARGE 34-36 inches (85-90 cm). Requires: 1 yard (91.5 cm) spandex; 2-1/2 yards (2.25 m) of 1/4 inch (6 mm) elastic; 1-1/2 yards (1.37 m) of 1/2 inch (13 mm) elastic. Please see this note regarding fabric requirements. Level: Fairly Easy