Today at work (I work as a home aide), my employer asked me to mend a skirt for her. The skirt was made of a stretchy two-way knit. I knew that if I used a regular running stitch, the stretchiness would be lost. So, I used this cool technique on handsewing a zig zag I saw in Generation T by Megan Nicolay. (Great book, by the way. I'll do a review of it soon.) Here's the technique:
Start by bringing the thread up through the fabric, close to the edge (but not so close it might pull off).
Then, go down about a quarter inch, and a little to the side, and push the needle through.
Next, go back up in line with the first stitch, and do the same thing.
Continue in that pattern...
And voìla! Zig zag stitch. AND, it's still stretchy:
This is what the back will look like:
Have a great day!