Named after (you guessed it) the Duke of Windsor, although some dispute this, the Windsor is a wide triangular knot that is usually worn for formal events. This knot looks best worn with a shirt collar that is wide spread or spaced. To prepare a Windsor Knot, first button up the top button of your shirt and turn up the collar. Then slide the tie around your neck. The two ends of the tie must be of different lengths. The wide end must hang down much longer than the narrow end.
Step 1: Lay the wide end over the narrow end.
Step 2: Bring the wide end up through the gap between the layover and your neck.
Step 3: Take the wide end to the right behind the layover, then forwards and up, then down into the gap between the layover and your neck.
Step 4: Take the wide end round the front of the layover, up close to your neck, and down through the loop just formed.
Step 5: Hold the narrow end and tighten the finished knot by pulling it gently up to center it on your collar.
FYI: This knot is better suited for men of a medium or shorter height or those with narrow chests or thin necks. It works best with lightweight fabrics.