For a casually sleek menswear style, consider pairing a brown wool blazer with a blue denim shirt — these two items work perfectly well together. Complement this outfit with a pair of blue athletic shoes to bring a sense of stylish nonchalance to your look. When it comes to dressing for autumn, nothing beats a knockout outfit that can take you from season to season. This outfit demonstrates how 20-year-old guys score in the style department.