This casual combination of a blazer and dark green jeans is a tested option when you need to look cool but have no time to pull together an outfit. During the colder months, when warmth is essential, it can be easy to surrender to a less-than-stylish ensemble. However, this ensemble is a good illustration that you totally can stay snug and remain equally stylish in the colder months. A no-brainer outfit appropriate for 20-something guys who prefer to dress casually.