Interlining is an intermediate layer that bonds two fabrics together using different methods, providing quality and a smooth appearance to garments, giving them the desired stiffness. Many of us purchase products from leading brands in the ready-to-wear industry without having much knowledge about how these products are stitched together and the techniques used to make them whole. One of the materials that make up a garment is interlining. What is interlining? And where does it exist in a garment? Interlining is commonly used in pants pieces, shirt collars, and cufflinks, among other areas. So, what is interlining, and what are its types? There are three types of interlinings: nonwoven interlinings, woven interlinings, and knitted interlinings, all serving the same purpose. The usage areas may vary depending on the desired stiffness and softness.