For a semi-casual ensemble, marry a dark brown blazer with a short sleeve shirt — these pieces go perfectly together. Want to dial it down on the shoe front? Complete this ensemble with a pair of white athletic shoes for the day. So if it's a boiling hot warm weather afternoon and you want to look sharp without exerting much effort, this ensemble will do the job in no time. Casual outfits for 20-year-old gentlemen aren't actually that hard, as you see.
For a casually sleek getup, consider pairing a dark brown blazer with a short sleeve shirt — these items go perfectly well together. And if you want to immediately polish up this look with a pair of shoes, complement your outfit with a pair of black leather loafers. Seeing as it's baking hot outside, this ensemble is ideal and entirely summer-ready. As you're going from your 20s to your 30s, you probably want to start dressing more like a mature gentleman. That's when combos like this are a solid bet.