Show that you do smart casual men's style like a connoisseur of men's style by wearing a white vertical striped suit and a black crew-neck t-shirt. Want to dial it down when it comes to shoes? Add black athletic shoes to this look for the day. Undoubtedly, you're looking at a great pick for a blazing hot summer afternoon. Laid-back combinations for 30-year-old gents aren't actually that hard, as you see.