Go for a brown crew-neck sweater and khaki chinos to feel unstoppable and look neat and relaxed. Finishing with a pair of brown leather casual boots is a fail-safe way to add an extra dimension to your look. There's no nicer way to spice up a dull autumn day than a stylish ensemble like this one. As you're moving through your teenage years, you probably want to look a little older than your age. In this case, combinations like this are a safe option.