So as you can see, it doesn't require that much effort for a man to look on-trend. Try teaming a dark green blazer with a light blue dress shirt and be sure you'll look incredibly stylish. For extra fashion points, add black leather loafers to the equation. Seeing as it's boiling hot outside, this outfit seems perfect and entirely season-appropriate. So if you're looking for a modern yet mature outfit for a gentleman in his twenties, this one is great.