This combo of a shirt jacket and a white and navy crew-neck t-shirt delivers comfort and efficiency and helps keep it low profile yet trendy. If you wish to effortlessly dial down this getup with shoes, throw a pair of black leather sandals into the mix. Totally summer-friendly, you can rock a version of this ensemble all season long. Wondering how to nail casual outfits as you progress through your teen years? This combo is a practical example.