The term 'sewed line' is a reference to a SEAM, which is a line of stitches used to join two pieces of fabric together. Sewing is a common craft that has been used for centuries to create clothing and other items. A SEAM is created by sewing two pieces of fabric together with a needle and thread. The stitches used in a SEAM are usually small and tight, creating a strong bond between the two pieces of fabric.