A grey blazer and dark green cargo pants are indispensable menswear must-haves to have in the casual part of your wardrobe. You could perhaps get a bit experimental in the shoe department and dress up your outfit by wearing burgundy leather brogues. One actually can keep your cool under the crazy heat, and this outfit is a bright example of just that A no-brainer pairing appropriate for over-30 men who like to dress casually.