This off-duty pairing of a sweatshirt and khaki chinos is extremely easy to throw together in seconds time, helping you look awesome and ready for anything without spending too much time rummaging through your closet. Jazz up this look with a more casual kind of footwear, such as these white and navy high top sneakers. When you're having one of those gloomy fall days, sometimes only a knockout outfit like this one can cheer it up. Incredibly stylish, this ensemble is also appropriate for a 20-year-old.