This combination of a white and black crew-neck t-shirt and black sweatpants combines comfort and utility and helps you keep it low-key yet modern. A pair of white high top sneakers will be a stylish complement to this outfit. During the winter months, when warmth is paramount, it can be easy to settle for a less-than-stylish outfit in the name of functionality. However, this outfit is a clear example that you can actually stay toasty and remain stylish during the winter months. Wondering how to nail casual looks after 30? This pairing is the perfect answer.