What's your choice among these four statements if wearing navy suits? 1. You should never wear tan shoes with navy suits. 2. You should match tan shoes with tan belts. 3. You should not match tan shoes with a tan belt. Belt must me much darker. 4. You should not wear a belt at all if you wear tan shoes. IMO tan (not light brown, but tan) shoes look bright so if matched with tan belt it looks much too risky. So, I assume you either should wear a black belt with tan shoes or no belt at all. The question is if these two options are allowed stylewise.