If you’re a jeans-and-a-tee kind of guy, you'll like the low-key but casually stylish combo of a black long sleeve t-shirt and black ripped jeans. For a smarter aesthetic, complement this ensemble with a pair of derby shoes. You can bet this look is the answer to all of your fall dressing woes. This combo shows how to succeed in the casual style department as a 20-year-old man.