Why the Four-in-hand is always better than the windsor knot:
It sounds like you've got your mind made up on a windsor, but let me just explain, for the sake of discussion, why I think the four-in-hand is better, particularly in this case. Please don't take this as argumentative. On your wedding day, if you decide to wear a full Windsor, forget all this entirely and enjoy your day.
Let's look at the above two pictures. The top looks to me like a full Windsor, the bottom a four-in-hand. Maybe if you yanked the top knot it'll get a little tighter, but it's basically going to look like that. In the top picture you look more boyish, short, and nervous. In the bottom picture you look more confident, relaxed, and mature.
The danger in wearing morning dress is that you look like you're a little boy in a costume headed to a fancy dress party. Of course you want to look like you're wearing something special, but for an important celebration, not to be an extra in a high school production of My Fair Lady.
Some people can avoid this just by having an austere or imposing look to them. Don't take this the wrong way, but you don't seem to me to have that kind of look. The full Windsor looks very "dolled up" and exaggerated - it has the feel of something a man does when he's straining to look important. That's why Jesse at PTO says it's for dicksand jerks. To me, in this case, it looks like you've been dressed by a costume designer or a wedding planner (FWIW the Windsor knot is relatively new and was never worn by the Duke himself - it was likely used to imitate the full knots that the Duke got by wearing ties with thick interlining).
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