I bound off the ribbing using my own variation of a stretchy bind-off. For the knit stitches, I Kf&b, passed the first stitch over the second, then passed the last bound off stitch over that one. The purl stitches were bound off as usual.
It's one of those garments that looks more interesting in the back. I have more of this yarn in a rust color. I might make another one with some other kind of back panel pattern.