Try teaming a crew-neck sweater with a white long sleeve shirt to feel invincible and look trendy. The whole ensemble comes together really well when you complement your ensemble with dark brown leather casual boots. During the colder months, when warmth is the priority, it can be easy to surrender to a less-than-stylish outfit. But this outfit is a striking illustration that you can actually stay warm and remain equally stylish in the colder months. A cool, less conservative pairing for a 30-year-old.