A multi colored print short sleeve shirt and olive shorts are the kind of a fail-safe casual getup that you need when you have zero time to plan out an outfit. For a modern hi-low mix, complement this ensemble with black and white athletic shoes. When summer settles in you want to feel comfy and stylish –– this outfit is just the one you need. When it comes to casual style tips for 30-year-old guys, this combo is perfect.