Fabric: 1 rectangle that is 1.5 times the circumference of the wearer by the length you'd like the garment to be. Hem the top and bottom edges of the rectangle. My tutorial example piece will become a top for a doll.
Elastic Thread: wind the elastic thread onto a bobbin by hand. Do not pull the thread tight as you wind and do not allow it to wind sloppily. A nice and gentle wind will work great.
Tie the elastic thread and regular threads together securely for each side. Leave the tails long until after you sew it into the garment.
This shows the knotted ends of each row.
The shirred fabric from the back.
If you'd like your shirring to tighten up a bit more, hit it with a burst of steam from your iron. You can now put right sides together and stitch up the side seam for a skirt, top, or a dress and add some simple straps.
The shirring technique is nice for necklines, sleeve edges, waistbands, and empire waist details. It can also embroidered and inset into a garment to resemble smocking.