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A piece of firm fabric or other material inserted between and usually sewn or fused to the layers of a garment to thicken or stiffen it.
1. (Knitting & Sewing) a piece of fabric sewn beneath the facing of a garment, usually at the inside of the neck, armholes, etc, to give shape and firmness
2. (Clothing & Fashion) another name for interlining
in•ter•fac•ing(ˈɪn tərˌfeɪ sɪŋ)
a material used between the facing and outer fabric of a garment to give support and shape.