Summarize the following:
Chain one, then work one single crochet into each stitch of the last skirt body round. At the end of the round, slip stitch the last stitch of this round to the chain-one. Note that these instructions use the same yarn for both the skirt and the edging. For an easy variation, you could fasten off the yarn at the end of the skirt body and join a second color using a slip stitch. After joining the new color, follow this steps and all the others as instructed. Chain one, then single crochet once into the first stitch of the previous round. Work four chain stitches. After the fourth chain, work one slip stitch into the first chain. This creates one bump or picot. For a smaller picot, only work three chains. For a larger picot, work five chains. Work one single crochet into each of the next four stitches. Assuming you had 128 (small), 136 (medium), 144 (large), or 152 (extra-large) stitches at the end of your skirt body, you'll need to work one picot into every four stitches. If your final skirt body stitch count varied, change the edging pattern so that the picots will be spaced evenly apart around the bottom of the skirt. As before, work four chain stitches, then slip stitch into the first of these chains. If you used a different number of chains in your first picot, continue using that same number for this picot and each one that follows. Single crochet once into each stitch. Work one picot into every four stitch. Continue this pattern until you reach the end of the round. At the end of the round, slip stitch the last single crochet together with the first. Cut the yarn, leaving a 4-inch (10-cm) tail. Pull this tail through the loop on your hook to tie off the yarn. Weave the remaining excess into the underside of the skirt. Slide a ribbon through the button holes in the waistband of the skirt. Use this ribbon to tie the skirt on when worn.  To prevent the ribbon from fraying, clip the ends into a "v" shape and/or apply seam sealant to the ends. Alternatively, slide a belt through the button holes instead of the ribbon. Completing this step completes the project.

Summary:
Single crochet across. Chain and single crochet once at the start of the next round. Work one picot. Single crochet across the next four stitches. Work another picot. Repeat all the way around. Fasten off. Weave a ribbon through the button holes.