When a dart is expected to look like a carefully pressed-apart seam or will be topstitched, it should be backed with a strip of self-fabric or lining. This strip should be cut out on the bias about 3 cm wide and about 2 cm longer than the actual dart. Pin the middle of the strip on one side of the basted dart (if the dart is to be topstitched, on the side destined for the decorative topstitching). Stitch the dart from the other side, including the strip. Then press the dart to one side and the folded strip (double layer) of the strip to the other side.