Here is an example of a basic suit. It's simple yet classy. Do not forget the tie clip! A floppy tie is enough to bring your whole look down. Also, a fitted shirt is key. You don't want to look like you are swimming in your clothes.
If you're not going to run, don't wear running shoes. 16 Ways To Dress Like A Grown Man Invest in quality. Every man should own a black lace-up shoe (they match everything) and a few slim, pointed ones.