For a casually neat look, make a white and blue dress shirt and black chinos your outfit choice — these items play perfectly well together. Up the appeal of your ensemble by slipping into a pair of chelsea boots. So if it's a roasting hot hot weather day and you want to look sharp without putting too much effort, this ensemble will do the job in next to no time. Incredibly stylish, this getup will also help any guy in his twenties look more mature.