I got a lot of questions on my preferred gathering technique so I decided to post a quick tutorial. I tried this out the first time when I needed to gather some heavy weight denim. I did three rows of basting stitches per Sarai’s instuctions in the Colette Sewing Handbook. but my bobbin threads kept breaking and the gathers were not coming out evenly. That’s when I remembered hearing about this dental floss technique and tried it out.
Dental floss is not required. Any thin, strong thread should work (such as embroidery floss or fishing line. All you need to do is place it in the seam allowance and set your machine to a wide zigzag. Then you simply stitch over your floss being careful not to stitch the floss itself. Then you just pull on both ends of the dental floss and gather. Voilà, a quick and easy method to adjust gathers.