This street style pairing of a black leather biker jacket and blue skinny jeans is extremely easy to throw together in next to no time, helping you look amazing and prepared for anything without spending a ton of time digging through your wardrobe. To inject a dash of stylish effortlessness into your outfit, add a pair of white and black athletic shoes to the equation. When it comes to casual style for 20-year-old guys, this ensemble is a good look on almost any gentleman.