It can sew two identical stitches at one time, the most common ones are two straight stitches in parallel
Sewing machines that support double needles can also be used on other pattern stitches
Industrial machines and old-fashioned foot sewing machines are not available.
The double straight stitches stitched out by the double stitches are decorative stitches, which are similar but different from the stitch stitches of the stretch sewing machine
