Wide Bengale Stripe with a Micro Pattern will always work. The key is to wear different pattern types with opposite size/scale. (side-note: the fine striped suit works because its a faint stripe and is smaller in scale compared to the dress shirt.
Guys--don't forget the simple things! Ironed shirts and jeans/slacks, a nice watch, and a nice pair of clean shoes go a long way. This photo is a good example, just because you're wearing jeans doesn't mean you should be wearing your nikes ;
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.