Falsely named after the Duke of Windsor, the Windsor knot (also known as the full Windsor or double Windsor) is a wide triangular knot that is usually worn for formal occasions. This type of knot looks best worn with a shirt collar that is considerably cut-away.
Drape the necktie around your collar and start with the wider end extending approximately 12 inches below the narrow end; cross it over.
Wrap the wide end around, and bring it up over and through the loop between the collar and the tie. Then pull it down toward the front.
Curl the wide end that is left behind the narrow end.
Bring the wide end back up again through the loop.
Put down through loop and pull around across narrow end as shown.
Bring the wide end up and tuck it through the loop a third time, and bring it back down to the front
Finally, pull down on the wide end carefully to tighten and draw up the knot snugly to your collar.
If both ends don't meet perfectly, simply start over and adjust the length of your tie accordingly. Make sure your collar falls nicely all around, and center the knot as best you can.
Windsor
Half - Windsor
Small Knot
Four-in- Hand
Prince Albert
Bow Tie