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Ikat – a style of weaving that uses a resist dyeing process similar to tie-dye on either the warp or weft before the threads are woven to create a pattern or design. A Double Ikat is when both the warp and the weft are tie-dyed before weaving. Through common usage, the word has come to describe both the process and the cloth itself. Ikats have been woven in cultures all over the world. In Central and South America, Ikat is still common in Argentina, Bolivia, Ecuador, Guatemala and Mexico. (read more about ikat fabric)

Illusion – A very fine sheer net fabric usually of nylon or silk. Used for veils.

Inego – The dextrose (sugar) that is taken from corn is used as fuel for the creation of the polymer this fiber is made up of. The polymer is formed into Ingeo “pellets” that can be used to make a wide range of products, from electronics to apparel. The fabric is beautiful, soft, and has performance benefits for sportswear. (read more about inego fabric)

Inotek – With Inotek fabric, the fibers close, causing the yarn to “tighten” and keep out any moisture. Instead of a heavy, saturated fabric, Inotek actually becomes 10 percent thinner when wet. (read more about Inotek)

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, non-woven, or knitted.

Interlining – Interlining is a layer of fabric inserted between the face and the lining of a garment, drapery, or quilt. Interlining is similar to batting, a thick layer of fiber designed to provide insulation, loft, and body to quilts, pillow toppers, and heavy winter jackets. Depending on the application, interlining materials can be woven, knitted, or created by fusing fibers together. Silk, wool, and artificial fibers with good insulating qualities are common choices for interlining. Some interlinings are designed to be fused, while others are intended to be sewn to one or both layers of the textile. As an inner lining within textiles, interlining is used in a number of applications. In many cases, interlining serves as an additional layer of insulation. For example, drapes are often interlined with flannel or a similarly thick material to keep rooms warmer in winter and cooler in summer, while many winter coats and pants use a thick layer of interlining to protect the wearer from the elements.

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.

Ioncell-F – A cellulose fabric created from plant material and ionic liquid. Developed by Scandinavian science and design students. Wood chips are dissolved into a pulp by the fabric’s namesake ionic liquid. The pulp is then processed to create the finished fibers that can be spun into yarn. (read more about Ioncell-F fabric)

Irridescent – Fabric woven with yarns of one color in the warp and another color in the filling so that the fabric seems to change color as the light strikes it. Other names for this type of fabric are changeable and shot.