If you're in search of a casual and at the same time seriously stylish getup, opt for a black blazer and a navy crew-neck t-shirt. Ramp up the appeal of this look by finishing off with dark brown leather derby shoes. Totally appropriate for blazing hot warm weather afternoons, you can rock a version of this look all season long. When it comes to fashion tips for men in their thirties, this look is a good look on almost anyone.