Yardage is for two toppers.

Instead of cutting the towels in half I left them whole, folded them in half and attached the topper along the folded edge. I also replaced Row 1 of the instructions (where the pattern has you SC into the towel to attach the foundation row) with a row of embroidery chain stitch done with a tapestry needle. This eliminated the need to push a crochet hook through the towel. I did not do the edging.

ETA 1/24/18 - Added edging.