For a laid-back menswear style with a modern twist, wear a denim jacket and skinny jeans. Introduce a pair of white leather low top sneakers to the equation to pull the whole thing together. So if you're searching for a modern yet mature ensemble for a 20-something man, this just might be it.
A denim jacket and skinny jeans will convey this relaxed and dapper vibe. In the shoe department, go for something on the classier end of the spectrum by wearing black leather chelsea boots. If you want people to see maturity in you as a gentleman in his 20s, an ensemble like this is a solid option.