How to finish an open edge with the invisible fasten off for lefties
For amigurumi pieces that'll be sewn onto another piece but with the edge still visible, there’s a slightly smoother way to finish the piece. Like the regular fasten off, once you’ve finished your last stitch, cut the yarn to make a tail. Remember to leave a tail long enough so that you can use it to sew this open piece onto another piece.
How to do the invisible fasten off in crochet (step-by-step with photos)
For pieces that’ll be sewed onto another, or for a piece where the edge will be seen, you can use a technique called the “invisible fasten off.” This technique makes the edge look smooth.