Such items as a navy and white sweatshirt and black jeans are the ideal way to infuse effortless cool into your day-to-day casual fashion mix. Dial up the cool of this outfit by rocking a pair of casual boots. This combo is everything for when temps are dropping and autumn is setting in. As you're going through your teen years, you probably want to start dressing more like a grown-up. If that's the case, outfits like this are perfect as inspiration.