Don't over dress

Keep it simple – You want a wardrobe that looks great on you, but don't overdo it. Avoid wearing more than 3 pieces of jewellery or more than 3 colours. Don't dress like a rock star unless you're in a band. If you want to be flashy, a simpler but stylish look would be sporting a black striped dress shirt with a white blazer, a dark pair of jeans, a dressy belt, and your sharpest dress shoes.
You could also add a flashy watch or a simple accessory like an interesting necklace, but nothing more. You don't want to look like you're trying too hard.