- 1). Measure around the widest part of your body with a tape measure. Add 8 inches to this measurement and then divide it in half. For example, if your body measurement is 40 inches, your final measurement is 24 inches (40+8 = 48/2 = 24).
- 2). Measure from the hollow of your neck to the point on your body where you want the hem of your costume to be located. Add 4 inches to this measurement and double it. As an example, 50 inches becomes 108 inches (50+4 = 54*2 = 108).
- 3). Cut a rectangle of fabric using the measurements from Steps 1 and 2. Using this example, the rectangle would measure 24 inches by 108 inches.
- 4). Fold the fabric rectangle in half by bringing the shorter ends together. Keep the wrong side of the fabric facing out.
- 5). Sew the sides of the rectangle together using a 1/2-inch seam allowance. Start your stitching approximately 1 ft. from the folded edge and continue to the bottom of the rectangle. This will sew the sides of the caveman costume together while leaving openings for your arms.
- 6). Mark the center 10 inches along the folded edge of the rectangle and trim along the folded fabric in this area to create a neck hole.
- 7). Turn the fabric right-side out and try on the caveman costume. If the neck hole is too small, use scissors to make it larger.