There is no such knot as the Double Windsor
the knot to which you are referring is the Full Windsor, and is the mark of the cad, so says James Bond.
(rnuk http://flickr.com/rnuk, Sun 17 May 2009, 11:43, archived)

I'll have you know that the Full windsor is infact, the knot of the ghetto.
Double Windsor - Tie The Phatest Knot Ever - Video

2 min 8 sec - 20 Jun 2007
Tie a knot like a pimp! I show you step by step how to tie a ballsy knot to go with your power suit every day. A real man knows how to tie a phat knot.
www.metacafe.com/watch/680611/
( Master Of Turnips. Only gays and morons believe in ghosts., Sun 17 May 2009, 11:47, archived)