The term 'line of fashion' refers to the construction of clothing. It includes three main components: the SEAM, inseam, and HEM. The SEAM is the line of stitching that holds two pieces of fabric together. The inseam is the line of stitching that runs along the inside of a garment from the crotch to the HEM. The HEM is the edge of a garment that is folded up and stitched in place. Together, these components form the line of fashion for any given piece of clothing.