I had to wear a vest at my old job. Here's the thing about a vest. Do not wear just a vest if you are dressed up. People will mistake you for a servant. If they see you with a jacket/vest/tie combo, then you are good, but do not wear just a vest and tie. It is terrible.
Also, I used to have to wear the most obnoxious tie for work. It was dark blue and had red and cream colored compasses on it. Because it was the four points, get it? Now I wear one that is similar to the middle tie posted earlier, but mine is tan with thin diagnol blue stripes about 3/4" apart. It looks really nice because I'm also wearing a tan suit to go with it. And this suit is tailored to fit me. Maybe I'll take a picture of myself in it later to show off what I wear at work.