While Windsor's Duke never used the Windsor knot directly, he preferred a broad triangular knot. In reality, the Duke achieved its trend-setting look by tying a Four-in-Hand with wide and extra-thick ties that were specially made. The public invented the Windsor knot as a way to imitate the style of the Duke's knot. There are several Windsor variants all of which are referred to with the same name. The Windsor offers a symmetrical and solid triangular knot with a stretched collar that works best. This knot is also wrongly called the "Double Windsor" knot. read more here.