Interfacing is an inner construction material that lies between layers of fashion fabric. It adds shape, strength, and body. Almost every garment you make requires some type of interfacing for inner stability. Interfacing supports the fashion fabric and adds crispness, not bulk. It is used to reinforce areas that are subject to stress and helps a garment maintain its shape, wearing after wearing. Interfacing is also required for many home decorating items to add support and shape. (UK Cooperative Extension Service)
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