Abstract: An elongated interlining material for facings, for example waistbands, having slits on at least one and possibly both of its elongated edges. The slits permit the sewing of the facing to a curved edge of a garment in the normal fashion. In particular, the material will follow curves in the garment without utilizing any special guides, sewing techniques, or equipment. The facing incorporates the interlining, at least partially enclosed in a stretchable, elongated fabric, or outerlining. The facing, in turn, is sewn to the garment's edge, with the exposed surface of the interlining, if any, adjacent to the garment. The slits, directed away from the edge of the garment, permit the interlining to adapt to a concave curve by opening and allowing the portions of material on either side of the slit to slightly separate from each other. Around a convex curve, portions of interlining material adjacent to a slit may overlap.