How to sew a folded top elastic waistband: Once you have sewn your crotch seams and side seams together, neaten the waist edge with an overlocker/serger. Cut the elastic to your personal length and lay one edge on top of the other and stitch together securely. Mark the elastic in quarters with chalk so the makings will match up with the centre front, centre back and side seams, so the elastic has an even spread. Pin the elastic to the inside of the waistband matching the chalk markings to the se