If you feel more confident wearing something functional, you'll appreciate this casual combination of a blue denim shirt and light blue skinny jeans. Introduce a pair of blue suede derby shoes to the mix to make the ensemble slightly more sophisticated. This getup is a foolproof option if you're scouting for a great, season-appropriate getup. As a 30-year-old gent, you probably want to start dressing like an adult man. If that's the case, getups like this are a life saver.