When it comes to high-octane elegance, this pairing of a blue denim shirt and navy dress pants never disappoints. For a dressier aesthetic, why not add dark brown suede tassel loafers to the equation? This combination is basically a lesson in how to master the summertime fashion. As you're going from your 20s to your 30s, you probably want to start dressing maturely. If that's the case, combos like this are ideal as inspiration.