For a cool and relaxed ensemble, pair a navy print crew-neck t-shirt with brown chinos — these items work perfectly together. You could perhaps get a bit experimental when it comes to footwear and dial down this look by wearing black and white canvas high top sneakers. The comfort and simplicity of this combo takes care of the heat and helps you make a sartorial statement wherever you go. And if we're talking casual style tips for teenagers, this getup is ideal.