The four-in-hand knot supposedly was the choice of coachmen at one time, hence the name. It is certainly the most common tie knot in the US, although I use the half-Windsor more, myself. Although, to be faire, I usually wear a bow tie, which simplifies everything: there's only one knot and I never have to worry about it being too long or too short. And I can tie it with my eyes closed.

And you'll never go wrong emulating McMurdo's style. He certainly demonstrates that more assertive hose colors really add character and punch to an outfit.

Since your charcoal ensemble is such a respectable and neutral color, you can afford to experiment with the other elements.

Andrew