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.
Rock a grey wool blazer with black trousers like a true gent. Grey Wool Blazer — Black Waistcoat — Black and White Polka Dot Tie — White Vertical Striped Dress Shirt — Grey Paisley Pocket Square — Black Leather Belt — Black Dress Pants