This classic and casual combination of a white and black horizontal striped crew-neck t-shirt and navy dress pants is very easy to pull together without a second thought, helping you look awesome and ready for anything without spending too much time searching through your wardrobe. There's no nicer way to spice up a dull fall afternoon than a killer look like this one. Pay attention to combos like this if you want to add seriousness to your 20-year-old's wardrobe.