What is a “triple interlocking stitch”?

>Your sewing machine may or may not have this stitch option. It’s Option #2 on (this) machine out of its seventy-five settings, which makes (one) think it’s fairly common on newer machines. It’s also known as a stretch stitch, or triple stretch stitch. [Sewaholic.][1]

[![Sewing options][2]][2]

Using a triple stitch.

>It looks like this on most machines and makes every stitch 3 times over (think more like backstitching, not side by side).
> 
>So what's the big deal with using this particular stitch?  It's meant for projects that require strength & elasticity and eliminates puckering on knits.  This makes it ideal for t-shirts, shorts and other knit items that are frequently used for appliqué.  I noticed on factory made appliqués, especially those on knits, you typically see stitching like this and that explains why those tend to last longer & look nicer than a lot of DIY versions. - [Sew Can Do.][3]

I have used this particular stitch in a project some years ago with a machine that did only one stretch stitch at a time. What I did is folded the edges of both materials in in opposite directions, interlocked the two hems and proceeded to baste the two pieces of fabric together. Once the basting was done, I passed the material through my sewing machine. When the first stitch line was completed, I repeated this stitch a second and a third time. It was not perfect , but it worked very well. I would suggest you go very slowly trying this out and at the same time trying to keep the stitch straight and in horizontal union with the stitch next to it.

Hope this helps and that I explained myself clearly enough.

  [1]: http://sewaholic.net/what-is-triple-stitch/
  [2]: https://i.sstatic.net/rvzK8.jpg
  [3]: http://www.sewcando.com/2013/06/purr-fectly-easy-applique-method-for.html