To assemble a casual ensemble with a fashionable spin, you can easily opt for a blue shirt jacket and white shorts. As for the shoes, stick to the classic route with dark brown leather derby shoes. You know when it's extremely hot outside, sometimes only a neat outfit like this one can get you through the day. As a 30-year-old man, you probably want to start dressing like a grown man. In this case, combinations like this are perfect as inspo.