How big should seam allowance be?
How big should seam allowance be? A 5/8″ (1.5cm) seam allowance is generally considered a standard. As this provides enough extra between the seam line and the cut edge of the fabric to ensure that the layers are all stitched when joining. It is also important for materials that unravel easily. How wide should Facing be? A bias strip of lining fabric can eliminate heavy shaped facings on bulky fabrics. A bias facing should be about 1/2 in. wide when finished. Cut the bias strip twice as wide as the desired finished width plus the width of two seam allowances...