Article: Lay about 2 to 4 feet (0.61 to 1.22m) of fabric that matches your dress on a work surface. Then, cut the fabric to a 134in (4.4cm) wide strip that's 1 inch (2.5cm) longer than the measurement for the waistline circumference. For example, if your waistline measured 38 inches (97cm), cut the strip 39 inches (99cm) long and 134in (4.4cm) 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 5.1cm) so the casing doesn't slide around.

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