Sew-In Interfacing gives structure to a piece of fabric. It's most commonly used for dressmaking and sewing garments. This is a lightweight interfacing that's ideal for use with plush or pile fabrics when a hot iron would damage the pile. You can also use it for patterning and drafting designs and making test garments. Use this medium-firm interfacing to create shaped areas in garments, including cuffs, collars, belts and more.