A white vertical striped crew-neck t-shirt and brown chinos are among those game-changing menswear must-haves that can upgrade your wardrobe. Introduce a dash of stylish casualness to by finishing with tan athletic shoes. This here is hard proof that it is actually possible to survive the oppressive heat and look cool and fresh while doing so. All in all, an ideal demonstration of relaxed casual fashion for 30-year-old men.