I was looking for instructions for ladder hemstitching a couple days ago, because I can't seem to remember which side I should start the stitching. I did the first end of the towel without instructions, starting from the left, and it felt awkward, especially the second row. I could find directions for the first half of the two rows in some of my books, but not the second row.
I decided to try it again, from the right side (I'm right handed), and snap some photos as I did the steps. Now I can refer to my own directions in the future.
My towel started with a plain weave hem. I wanted a hem about one inch wide, so I wove about 2 1/2" before starting the hemstitching. I cut a tail from the weft, about 3-4 widths long. Thread a tapestry needle (which has a blunt tip) with the tail.
Some of the first row. The spacing will look neat and even, if the thread is kept taut while stitching.
This shows two spacer rows woven in with a smooth, heavier yarn. Make sure the heavy yarn is in the correct shed if it matters which direction your plain weave needs to be woven. Leave four widths of yarn at the right side, and weave several picks of plain weave.
Start the second hemstitching like the first, threading a tapestry needle with the tail. Start with the needle under the first bundle, up and around the bundle, coming up between the bundles, two threads above the row.
Hold the thread taut, needle under the next bundle,
Finished ladder hemstitching. The spacer yarn is pulled out after wet-finishing the piece. Turn the hem. Finish by hand, or as I did, by using matching thread and the zig-zag stitch on the sewing machine. Adjust the stitch length, so each zig goes into a hole, and each zag catches the hem.