Why not make a grey shirt jacket and a long sleeve shirt your outfit choice? These two items are totally comfortable and will look nice married together. Give a mellow touch to your outfit by wearing black leather slip-on sneakers. Loving that this outfit is great when cooler weather hits. As you're going through your teenage years, you probably want to start dressing more like a grown-up. If that's the case, combinations like this are a surefire option.