I am trying to catch up on some more TAST (Take A Stitch Tuesday) stitches.
To learn what TAST is, go to Pintangle.
Here is the Alternating Double Chain Stitch, which in my eyes looks like the Shell Chain (TAST#97) with the little Chain stitch on alternating sides.
To follow Sharon B's excellent tutorial and learn this stitch, click here.
As I am organizing my TAST stitch collection to suit ME, I have given it the number 144.
On the TAST Reference Chart it looks like this. I don't think it is a good stitch for curves...