For an outfit that's very straightforward but can be modified in a variety of different ways, consider teaming a crew-neck t-shirt with khaki chinos. A cool pair of dark brown casual boots is a simple way to give an extra dose of style to this look. This one is a smart choice if you're crafting a well-coordinated outfit for weird transition weather. Wondering how to perfect casual outfits as a teenage guy? This pairing is a vivid example.