innocent eyes That's just the first of her videos on edge stitches. There's more! Yeah, I knew it was overkill, but it's a handy link. Lately I'm playing with icord edgings. I won't give you any links for those, I'll be nice for a change.
If your shawl has a diagonal edge, I can't tell from pics I've seen, I think you might be happier with a slipped stitch. Just sayin'.