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FreeSewing

A zig-zag stitch is used to prevent the SA of the denim from fraying

A zig-zag stitch is useful for when you need to sew a stretchable seam (like when using knits). You can also use it for a decorative effect, or to lock the edge of your fabric.

As most, if not all, sewing machines can sew a zig-zag stitch, it’s a popular alternative for when more specialised stitches are not available.

Everyone’s favourite encyclopedia has more on the zig-zag stitch: Zigzag stitch on Wikipedia

Picture by Kristin Roach