This casual street style pairing of a black crew-neck t-shirt and black skinny jeans can be taken in different directions according to the way you style it. Get a little creative on the shoe front and elevate your outfit by sporting a pair of white leather low top sneakers. A killer outfit like this one is just what you need on a boiling hot summer afternoon. Wondering how to nail casual style as you make your way through your 20s? This combo is a perfect example.