Tailor's Lines is a term used to describe the lines that are created when a tailor sews two pieces of fabric together. The most common type of Tailor's Line is an inseam, which is a seam that runs along the inside of a garment from the crotch to the hem. Inseams are usually made with a straight stitch and are used to join two pieces of fabric together. They are also used to create pockets, pleats, and other details on garments.