The term SEAM, SAY is a crossword solution that consists of three letters: SEW. Seams are an important part of garment construction and are used to join two pieces of fabric together. Seams can be either visible or hidden, depending on the type of fabric and the desired look. Sewing machines are used to create seams, and hand-stitching is also used in some cases. Seams are also used in upholstery, drapery, and other home decor items.