Drawstring: On the front of your pants, measure two inches from the top of the waistline to the center seam. Mark this point. Measure a 1 1/2" out from this point to the right and left. Mark a 1" vertical line on each side, as shown. There should be 3" between each line, and they should be the same distance from the center seam.
Use a buttonhole stitch or the buttonhole setting on your sewing machine to stitch along the vertical chalk lines.
Elastic: For an elastic drawstring, measure around your waist with the measuring tape. Cut a strip of elastic at this length. We will insert it in the next step.
Next, we will fold down and stitch the waist.