Bruce Lee quote - If you always put limits on everything you do, physical or anything else, it will spread into your work and into your life. There are no limits. There are only plateaus, and you must not stay there, you MUST GO BEYOND THEM.
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.