Clothing
1. There is only two color suits you should wear for an interview, Blue or Grey
2. White point collar shirt
3. Lace Up shoes (Brown with a blue suit)
Grooming
1. No facial hair (If you choose to wear facial hair make sure it is totally groomed)
2. Breath mints is a MUST. No gum!
Etiquette
1. Top button must be buttoned while walking in
2. Unbutton the top button when you sit down
3. Make sure to look the hiring manager in the eye
Source: Men’s Style