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.
Plank exercise benefits are great - it can help you get rid of fat layers around the belly, relieve the pain in your back, and speed up your metabolism. http://whymattress.com/how-to-choose-the-best-mattress-for-back-pain/