Hard proof that a charcoal knit blazer and a white crew-neck t-shirt look amazing together in an off-duty outfit. On the fence about how to finish off? Complement your outfit with a pair of white leather low top sneakers to jazz things up. One actually can keep your cool under the sweltering heat, and this outfit is proof of just that Those who wonder how to wear cool casual dressing as you progress through your adolescence, you have your answer.