A dark brown bomber jacket and navy sweatpants are the kind of a foolproof casual ensemble that you need when you have no extra time to dress up. On the shoe front, go for something on the casual end of the spectrum and round off this ensemble with black athletic shoes. As the weather starts getting warmer, it's time to get rid of those heavy winter gear and opt for an ensemble that's lighter, like this one here. And if we're talking outfit ideas for teenagers, this combination is ideal.