The edging I suggested in the post above, is very easy, looks professional and is smooth. It curls in the opposite direction making the armhole edge or neckline (as I used in the sleevless top) lie flat. This is one way you use stocking knit's tendancy to curl to your own advantage.
Bamboozle cabled sleevless top.
She's put crochet around the armholes to stop them from curling under, but I can tell you from experience, this won't work. The straps are stockinette, which curls, and the crochet will curl right along with it. Only some sort of facing will make that edge lie flat.