WHAT IS IT?
A zigzag seam finish is a seam finish done with a row of zigzag stitching sewn on a regular sewing machine. The seam is pressed open or pressed to one side with zigzag stitching sewn along the seam allowances to keep them from fraying.
Zigzagged seam finish
WHEN DO YOU USE IT?
A zigzag finish is suitable for light- to medium-weight fabrics. Most people who don’t own a serger (see Seam Finishes, Serged or Overlocked one page link) will use a zigzag finish instead.
Tips + Notes
- Test your zigzag stitching on a scrap piece of fabric to see what it will look like on your project.
- Make sure the zigzag doesn’t pucker. If it does, loosen the tension or change the stitch length.
- You many choose to zigzzg seam allowances before sewing the seam, especially on curved seams.
HOW TO SEW A ZIGZAGGED SEAM FINISH
Sew the seam with a regular 5⁄8″ (1.5cm) seam allowance. Press the seam open.
With the right side of the seam allowance up, separate one seam allowance from the rest of the garment so you are ready to sew through it as a single layer. Sew a zigzag stitch along this side of the seam allowance by lining up the edge of the presser foot with the edge of the seam allowance.
Repeat with the other side of the seam allowance. Press the seam again to flatten the stitching.
Source : The Sewtionary An A to Z Guide to 101 Sewing Techniques + Definitions
About the Author : Tasia ST. Germaine