because the style of knotting the tie.... the simplest 'knot' is similar to the knot used to tie 'four in hand' reins..

its a way of saying 'he tried to dress up, and look like a gentleman, but he really didn't know how to tie a tie, so he knotted round his neck with the only knot he knew, the same one used to tie up horses reins'... all with teh simple expression of 'four in hand'

(think of the term floods applied to clothes..


my other obsession