Make a grey long sleeve shirt and a grey vertical striped long sleeve shirt your outfit choice for a simple look that's also pulled together. To give your getup a more sophisticated spin, why not complement your outfit with a pair of dark brown leather casual boots? So so as you can see, it's an on-trend, not to mention spring-friendly, combo to keep in your transeasonal rotation. As you're transitioning from your 20s to your 30s, you probably want to start dressing like a grown man. If that's the case, getups like this come in very useful.