There’s many ways to create a crochet edging but making little Irish crochet style picot stitches along the outer edge may be one of the simplest ways to create a charming edging for your projects.
You can either work this edging as shown in this vintage illustration and sew it onto a larger piece or simply crochet the last row using this easy stitch.
The vintage crochet book that I found this idea in, appears to plan on sewing the crochet edging to a larger piece. They called this stitch a drooping picot. With a little adjustment, it can be worked right onto that larger piece or foundation. And, the best part is that this edging creates one picot for every stitch and does not require a particular increment of stitches as a base.
Simply chain 5, take the hook out, insert the hook into the first chain stitch and through the working loop, yarn over hook and pull through the two loops on the hook. To make your picots even, always insert the hook in the same side of the first chain stitch and be sure to maintain the correct orientation for the working loop when you reinsert the hook.
Attached Crochet Edging
To make a drooping crochet picot on a foundation row, make a regular single crochet stitch, chain 5, take the hook out of the working loop, insert the hook into the first chain stitch (not the single crochet stitch) and through the working loop, yarn over hook and pull through the two loops on the hook.
The trick here is when you go to make the next single crochet in your foundation row, be sure to consistently work either in front of or in back of the picots.