Sew bias tape around the neckline leaving ends that are long enough to fasten the bib. I sew it to the wrong side of the towel first, then fold it over and sew it on the right side. It makes it look nicer on the right side. Be sure to sew the extra length of bias tape shut so that it doesn't unravel in the wash.

And there it is! This can go super-fast, or you can take a little longer and make it look really nice. This would probably even be a nice gift for somebody if you are actually capable of sewing a straight line, unlike myself.