We're all seeking practicality when it comes to styling, and this casual combination of a white and red and navy long sleeve shirt and skinny jeans is a vivid example of that. To bring some extra definition to your getup, complete your ensemble with brown leather derby shoes. As you're moving from your 20s to your 30s, you probably want to start dressing like an adult. In this case, looks like this become a great source of inspo.