An article on how to tie a tie was posted before. However, that post focuses on the how to tie a knot and ten ways are introduced. Here we focus on the details for each knot and what is the benefit for that knot.
Double knot is an easy variety of four in hand knot. Actually, it just adds one more around during your wrapping the triangle tie knot.

Double Knot - tie a tie
The only extra work is just one extra round than the normal four in hand. So the double knot can solve the problem if you have an extra long necktie. As for the aesthetic benefits, the key is the exposed wrapping loop from the underneath because of the double loops. It can add a bit relaxation feel for the serious dress code from the necktie.

Double Knot - tie knot
Tags: double knot, how to tie a tie, how to wear neckties, necktie knot, tie knot