Rock a crew-neck t-shirt with a navy vertical striped suit to create a casually smart and well-executed ensemble. On the shoe front, go for something on the classier end of the spectrum with brogues. If you want to project maturity and professionalism as a 20-something man, an outfit like this is a viable option.
You'll be surprised at how easy it is for any guy to get dressed this way. Just a crew-neck t-shirt matched with black jeans. To introduce a bit of zing to this outfit, add a pair of brogues to the equation. This combo proves that dressing well as a guy in his twenties is not that daunting a task.
If you don't like spending too much time on your getups, consider pairing a crew-neck t-shirt with charcoal chinos. For something more on the sophisticated side to finish this look, complete your ensemble with brogues. Wear this outfit to create a more mature image.