A black long sleeve t-shirt and black skinny jeans are great menswear elements to add to your current wardrobe. Brown leather chelsea boots will easily polish off even the simplest look. During the winter season, when comfort is crucial, it can be easy to settle for a less-than-stylish getup in the name of convenience. This getup, however, is a stark illustration that you can actually stay cozy and remain stylish during the winter season. And if we're talking casual clothing for 30-something gents, this ensemble is perfect.