Team a grey gingham long sleeve shirt with a white crew-neck t-shirt for an effortless kind of refinement. On the fence about how to round off? Introduce tan leather snow boots to your outfit for a more laid-back aesthetic. On not-so-chilly afternoons, you can wear a variation of this easy-to-transition getup and look absolutely amazing. And if we're talking casual fashion tips for 30-something men, this ensemble is perfect.