A navy turtleneck and navy jeans? This is an easy-to-create look that you could wear a variation of on a day-to-day basis. If you need to effortlessly kick up your look with one single piece, why not go for dark brown leather derby shoes? A perfect example of transitional style, this getup is a staple this spring. As a 30-year-old, you probably want to start dressing like an adult. That's when getups like this come in very handy.