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What Is Interfacing? A Practical Guide for Sewists TL;DR: Interfacing is a support fabric applied to the wrong side of textiles to add stiffness, shape, and stability. Choosing the correct type and attachment method is essential for maintaining garment structure and achieving a professional finish. Interfacing is defined as a support fabric applied to the wrong side of a garment or textile to add stiffness, shape, and stability to areas prone to stretching or distortion. The Cambridge Dictionary notes that in electronics and computing, “interfacing” also refers to connecting systems to …