Jeny鈥檚 interlock cast off exactly mirrors the long-tail (and the backward loop) cast on AND is a very good stretchy bind off.
This baby sweater is knit bottom up, but I made the sleeves top down, picking up stitches around the armhole, so to get the same edge on the ribbing, I did the long-tail cast on on the body and the interlock cast off on the sleeves.