The yarn-over bind-off is more elastic than the standard bind-off and is a bit more decorative. Use the yarn-over version when you need some stretch to the edge of your project, such as for the cuff of a toe-up sock. It’s also useful for the edge of a lace shawl or for ruffles.
Here’s how the yarn-over bind-off works:
Knit 1 stitch, yarn over the RH needle, and then knit 1 more stitch.
You now have a stitch, a yarn-over, and a stitch on your RH needle.
With your LH needle in front of your RH needle, insert the LH needle into the yarn over on the RH needle.
Bring this loop over the second stitch (the last stitch knit) and off the tip of the RH needle.
You now have 2 stitches on your RH needle.
With your LH needle in front of your RH needle, insert the LH needle into the first stitch on the RH needle.
Bring this loop over the second stitch on the needle, leaving 1 stitch on the RH needle.
Yarn over the RH needle and knit 1.
Repeat Steps 2 through 6 until you have 1 stitch remaining on your RH needle.
Cut the yarn 6 inches from the needle and pull the tail through the last stitch to lock it.