Style: The Bow Tie
I love a bow tie. I think it's classic, classy and special. Tying one is a lost art and when I see a man sporting one, I know he's given some thought and attention to how he looks.
Tying one is not hard to do, and I think every true gentleman should at least know how. Here is a brief video tutorial for the uninitiated.
I also think the sign of a great gentleman (and lady for that matter), is the ability to help. To that end, here is a pictorial showing how to tie a bow tie on another person. Your nervous groom friend will be grateful you have this skill!
May you always look your best.