For a look that's truly Kingsman-worthy, consider wearing a blazer and a dress shirt. A great example for any gent who's not sure how to dress as a 20-something man.
Dress Shirt with Blazer Dressy Cold Weather Outfits For Men In Their 20s
A blazer and a dress shirt make for the ultimate stylish outfit. If you're in your early 20s, take cues from combinations like this to add more seriousness to your wardrobe.
A blazer and a dress shirt are strong players in any gentleman's wardrobe. Add a pair of tobacco leather double monks to the mix et voila, your getup is complete. Ideal to show the world that even as a young guy you're confident enough to hold your own in the fashion department.
Dress in a blazer and a dress shirt to look like a proper dandy with a great deal of style. Now all you need is a pair of black leather loafers. A perfect combo to demonstrate the world your maturity even as a man in his 20s.
A blazer looks especially sophisticated when teamed with a dress shirt. A pair of dark brown leather brogues is a tested footwear option here that's also full of personality. If you want people to see maturity in you as a 20-something, a look like this is a goofproof option.