I don't wear this knot terribly often, but it's very handy to know, as there are two variations using a square knot, and once you know how to tie this one, you can do it without a mirror...
Start with a bias folded scarf, or a rectangular scarf, and center it behind your neck like so:
Bring the left part over the right part:
and loop it over and through - standard knot-tying procedure:
Now here's where many people go awry. Your normal instinct is to take the "new" left end and take it back over the "new" right end. Resist such instinct, and instead, bring the RIGHT SIDE OVER THE LEFT SIDE. (I could get into a technical explanation of how changing direction alters the direction of the weave of the fabric ... View the Post