A blue double breasted blazer and a beige long sleeve shirt are among the key elements of any gent's closet. Feeling inventive today? Break up your ensemble by sporting a pair of brown leather loafers. This look is the definition of ideal for when leaves turn yellow and red and autumn is in the air. As a 30-year-old guy, you probably want to start dressing like a grown-up. In this case, getups like this are ideal as inspiration.