I positioned the rickrack so that it was halfway over the edge of the ruffle.
After that, you draw up the stitches to produce the ruffles. I started out by pulling the thread ends, but also had to pull up some of the stitches with a needle or a skewer.
Keep arranging the fullness of the ruffles until they are evenly arranged.
This shirt had a nice clean-finished edge, so I just pinned the ruffles underneath the hem and sewed them down, adding another layer of rick-rack as I went.
I was very pleased with this quick sewing project. I think Charlotte was, too!