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.
Try teaming a cognac suede bomber jacket with black jeans for a casual level of dress. Tap into some David Gandy dapperness and complete your look with white low top sneakers. Shop this look on Lookastic: