As a general rule, a Black Formal shoe will go with nearly all suit colors. However, you can make more of an impact if you go for a brown or tan shoe when wearing either a Navy/Blue or Light Color suit. You should match your shoes to the color of your suit using this rule:
Black Suit = Black Shoe
Charcoal Grey Suit = Black Shoe
Light Grey Suit = Black Shoe or Brown Shoe
Any Shade of Blue Suit (Navy, Powder Blue etc.) = Brown Shoe or Black Shoe
Brown Suit = Brown Shoe
Your belt should be fairly thin and should be the exact same color as your shoes. Black and Brown (including different shades of brown such as tan) are preferred for a corporate look.
If you’re going for more formal business attire, opt for a double-button, notched lapel jacket.
Always unfasten the buttons on your suit when you sit down. NO exceptions
Your tie should JUST reach the waistband of your trousers or the center of your belt buckle.
Your sleeve cuffs should be exposed to half an inch. For a harmonious look, try to match the visible cuff length to the amount of collar that is visible at the back of the neck.
Never wear a Backpack with Suit, opt for a nice briefcase or a messenger bag.