Finally finished the skirt. It looks nice, but I probably won't wear it around town. I don't want to stand out.
For finishing the hem, I decided against doing the garter stitch and the picot finishing. The checkerboard pattern meant that it wouldn't curl (and so it didn't need the garter stitches)-- and picots aren't my style. So I just finished it by a knit cast off on the knit stitches and a purl one on the purl stitches.