This combo of a navy denim blazer and a white crew-neck t-shirt epitomizes laid-back cool and relaxed menswear style. Go ahead and complete this outfit with white canvas low top sneakers for a dose of stylish nonchalance. This one is a nice choice if you're planning a well-coordinated outfit for unpredictable fall weather. Ideal for a 30-year-old if you want to project a more relaxed spirit.