Such items as a navy crew-neck t-shirt and shorts are an easy way to introduce extra cool into your daily casual routine. You could perhaps get a little creative when it comes to shoes and dial down your outfit with a pair of navy and white athletic shoes. No doubt, it's easier to work through a blazing hot hot weather afternoon in a light and breezy combination like this. This combination demonstrates that maturing from your 20s to your 30s is no reason to stop dressing casually.