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Pillow case crocheted edging - This one starts after the blanket stitch is already done so, if you can't figure that out, you'll have to find a tutorial (there are some on youtube). This technique could, certainly, be used on other items, purchased clothes, cut offs, jeans, capris, curtains, towels...pretty much anything.
tutorial in pictures (Japanese blog) you need knitting needles as well as a crochet needle, it´s cro-tting ;)