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The purpose of a lining is to add to the comfort of the wearer; preserve the shape of a garment or add body to it; and conceal construction details and raw edges of fabric, thus giving a finished appearance to the inside of the garment. A neatly applied lining usually adds to a garment quality.
The fabric and style of the garment may influence whether a lining should be used. Woven fabrics are more frequently lined (to conceal raw edges) than knit fabrics. If a woven fabric coat or jacket is not lined, give seam allowances and facings a special treatment so the garment will have a nice inside appearance when it is removed. It is most satisfactory to line a garment when instructions (and pattern pieces) are included with the garment pattern. While many "unlined" jackets can be lined, the design of many others (with pleats, tucks, or special seaming) make it difficult to add a lining. Check the pattern carefully before attempting to line an "unlined" garment.