Add a ruffled edge to the last row, or a finished edge, by picking up all the stitches along the edge. Step 1: As demonstrated in Photo 12, knit into the front and back (kfb) of each stitch to double the number of stitches on the needle. Step 2: Purl across. Step 3: Knit across. Step 4: To keep an elastic edge, single-crochet bind-off all the stitches as follows: Insert crochet hook into first stitch, yarn over and pull a loop through. Insert hook into next stitch, yarn over and pull through a loop. There are now two loops on the hook. Yarn over and pull through both loops. Continue to single crochet the stitches off the needle.
The size and amount of ruffling can easily be modified by adding more rows, as you can see in Photos 13 and 14. Experiment with adding another row of increases to exaggerate the curves.