Crocheted edging on knitted sweaters

I have sometimes put a crocheted edging on a knitted sweater, usually at the neckline but sometimes the bottom and sleeves, too.
I have never really been completely happy with them, though, on stockinette or anything that might roll otherwise. The darn thing still often rolls for me!

I have the feeling that it is how I am starting out the edging. I begin with a row or round of single crochet, sometimes several, before starting my shells or picots or crab or whatever I’m using.

What might I be doing wrong? Is it just not enough rows or rounds of sc? Picking up too many or too few stitches? Incorrect hook size?

I’d love to hear your ideas and experiences! Also, if anyone can suggest a book with basic crochet edgings that would be suitable for sweaters, I’d appreciate it. I’m getting a little tired of doing shells, picot, and crab!

I would do one row of single crochet and then begin my edging pattern. You should be able to do any edging with just one foundation row of sc. You might be picking up too many stitches. When you use the cast on or bind off stitches I would suggest doing a one to one ratio of sc. In binding off if you use the crochet bind off then you will have the stitches you need to begin with a row of sc or start your edging right then. I use different binds off but the crochet would probably be better for you if you plan on adding an edging. As for books there are plenty on the market. I would suggest you look around until you find one you like. I have many and some are even in Japanese but the patterns are symbol patterns.