More than two different colours, patterns and textures in combination is very hard to successfully pull off and even if you do you'll draw attention to yourself. If that's not the aim of the game (and it usually is not) it's best to stick to just two colours, patterns or textures in your combination. To complete your look make sure you wear a matching belt to your shoes and your socks should be the same colour as your suit.
David Beckham is known more for his street fashion but when he wears a suit he usually gets it right. Here at top he wears a classic grey suit and white shirt combination but the feature is the black textured tie. Below he is in a modern cut blue suit with white shirt but again the tie is the feature in a striking red satin silk. Keep it simple with the focus on one element and you can't go wrong.