stitched line on a piece of clothing where two fabrics meet

The stitched line on a piece of clothing where two fabrics meet is called a seam. A seam is the line of stitching that joins two or more layers of fabric together, forming the basic structure of a garment. The area between the fabric edge and the seam line is known as the seam allowance. Seams can also serve decorative purposes in addition to joining fabrics.