Knit double the desired length for the neckband.
Put the live stitches on a spare yarn,
turn the neckband to the wrong side,
use pins or stitch markers to stable the position.
Sew the live stitches to the pick-up row.
Conclusion: For light weight yarns, this is really the best way to make a crew neckband because without having to bind off, the collar is comfortably stretchy.