Make a navy knit cardigan and a white crew-neck t-shirt your outfit choice for a casual kind of sophistication. For something more on the daring side to finish off this getup, complete this look with white athletic shoes. So if you're looking for an ensemble that's seriously stylish but also feels entirely spring-friendly, this one fits the task well. If you're not sure how to dress as a 20-something gent, this combination is a safe option.