In Parts I and II of this topic, I covered sateen, dimout and blackout linings, which are the linings you see from the outside. (See Linings and Interlinings Part I and Linings and Interlinings Part II). What about the lining on the inside? Yes, lining on the inside or interlining, an added layer of material that can serve several different purposes. Flannel Interlining The most common interlining is flannel. Flannel is a cotton, napped fabric available in white, natural