Variation of Elizabeth Zimmermann's sewn bind-off that mimics long-tail cast-on
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This method puts the corded-looking side of the bind-off on the same side of
the work as the final row, but could be modified to put it on the opposite side.
Tested with chained edges, where the first st of each row was slipped knitwise,
and the last st purled.

1. On the last row, slip final st purlwise w/ yarn in back instead of purling it

2. Transfer sts to a needle ~2 sizes smaller

3. Measure out a tail at least three times the length of the bind-off, plus 4-6"

4. Thread it through a tapestry needle, and turn work as if to continue knitting

5. Bring the yarn around the side of the work to the back, going under the
   needle tip and around the st you slipped

6. Pass the tn through the *second* st from back to front under the needle (i.e.
   purlwise); pull it through and snug up

7. Pass the tn through the first st from front to back under the needle (i.e.
   knitwise), making sure it goes *over* the previous pass in back (not usually
   a problem); pull it through and snug up

8. Drop the first st off the needle

9. Repeat steps 6-8 to the end.

Note that this bind-off is very stretchy, so you can snug it up rather firmly
while sewing and it will probably still be looser than the long tail cast-on.