Article: Lay about 2 to 4 feet (0.61 to 1.22 m) of fabric that matches your dress on a work surface. Then, cut the fabric to a 1 3⁄4 in (4.4 cm) wide strip that's 1 inch (2.5 cm) longer than the measurement for the waistline circumference. For example, if your waistline measured 38 inches (97 cm), cut the strip 39 inches (99 cm) long and 1 3⁄4 in (4.4 cm) wide. Wrap the casing you just made right below the line you marked on the dress. Line up the ends of the casing with a seam that's on the inside-out dress. Depending on your dress, you could line it up with a side seam or a seam that runs down the back of the dress. Then, secure the casing with sewing pins. Try to pin every 1 to 2 inches (2.5 to 5.1 cm) so the casing doesn't slide around.

What is a summary?
Cut a strip of fabric that's 1 inch (2.5 cm) longer than the circumference. Pin the casing just below the waistline you marked on the dress.