|When making a garment that calls for a drawstring...it's easy to make the drawstring "adjustable". The "adjustable" part comes from the fact that part of the drawstring, is actually elastic.
To make the drawstring, I cut two equal portions of the material on the bias, and then serge the edges and turn. Next I will take elastic that is @8" in length and 1/4" wide, and then will join each end of the elastic to the fabric and will stitch to join. Once finished I will insert the drawstring.