I have a friend who does crochet work. He just made a hat for his grandson. When I held it, naturally I tested it for stretchiness for the last row. Since it is for a young boy, I think it will fit fine. But I was wondering, if any of you crochet, is there a stretchy bindoff that crocheters use when finishing a hat? I found lots of ways to use a crochet hook to bind off in knitting but none for crocheting? Thanks in advance if anyone can steer me and my friend in the right direction.