I
Interlining
An insulation, padding, or stiffening fabric, either sewn to the wrong side of the lining or the inner side of the outer shell fabric. The interlining is used primarily to provide warmth in coats, jackets, and outerwear.
Interfacing
Fabrics used to support, reinforce and give shape to fashion fabrics in sewn products. Often placed between the lining and the outer fabric., it can be made from yarns or directly from fibers, and may be either woven, nonwoven, or knitted. Some interfacings are designed to be fused (adhered with heat from an iron), while others are meant to be stitched to the fashion fabric.
Interlock
The stitch variation of the rib stitch, which resembles two separate 1 x 1 ribbed fabrics that are interknitted. Plain (double knit) interlock stitch fabrics are thicker, heavier, and more stable than single knit constructions.
