When it comes to high-octane classic style, this combo of a white and black dress shirt and a grey three piece suit doesn't disappoint. To infuse a touch of stylish nonchalance into this ensemble, add derby shoes to the equation. You're guaranteed to always look stylish even despite the crazy heat if you have this outfit as a last-minute grab. Wear this combination if you want to project a more mature image as a gentleman in his 20s.