For a look that's classy and envy-worthy, try teaming a white and navy vertical striped dress shirt with grey dress pants. When not sure as to the footwear, complement your outfit with a pair of dark brown suede oxford shoes. You know when it's roasting hot outside, sometimes only a knockout outfit like this one can get you through the day. If you frequently wonder how to dress as a 20-year-old gent, this getup is a perfect example.