When the setting allows a casual getup, you can go for a navy raincoat and dark brown chinos. Grey athletic shoes are a simple way to infuse a sense of stylish nonchalance into this outfit. So when summer is over and autumn is settling in, this outfit has a good chance of becoming your go-to. So if you're looking for outfit ideas on what to wear as you progress through your teen years, this combination is definitely worth saving for later.