For something on the casual end, consider this combination of a white and black sweatshirt and chinos. When it comes to shoes, go for something on the relaxed end of the spectrum by rocking white athletic shoes. In winter, when functionality is key, it can be easy to surrender to a less-than-stylish ensemble. This ensemble, however, is a shining example that you totally can stay warm and remain equally stylish during winter. This ensemble proves how 30-year-old gentlemen slay in the style department.