If you know how to bind off with a picot hem, you already know exactly how to work a bind-off hem the way I do it. I’m not even sure this technique is that odd, really–I just couldn’t easily find a tutorial that worked bindoff knit hems the way I do, and I think this way is pretty easy; it doesn’t require sewing.
Once you’ve worked the number of rows called for by your pattern, you’re ready to bind off.
This bindoff hem is pretty easy–you just begin at the beginning of your round (in this case), knit the live stitch on your needle together with the corresponding purl-bump, and do the same with the next live stitch and its purl bump. Pass the first worked cast-off stitch over the second the way you would with a basic bind-off, and continue in this fashion until all live stitches are consumed. Then break yarn, weave in ends, and you’re done.
The only tricky part to this is figuring out which purl bumps to knit together with the live stitches, and that’s pretty easy once you get started–the stitches are all in the same row, so when you pull on a purl-side bump the next stitch shows tension. With this example, it’s even easier, because of the stripes: the purl bumps to be picked up and worked are the MC bumps right above the last CC bumps.
As you work around, you get a little chain stitch bind-off ridge. I do not like it very much during the work-in-progress stage, but it flattens out with blocking. (Blocking is kind of important to this piece, because of that. I give the Grays Harbor cowl a gentle wet block just to even everything out. )
Once you’ve worked all your stitches (and technically, woven in your ends, I guess), you’re done!