PHILADELPHIA — Leo Mulvihill looks the classic man’s man.

The hat is one clue. Displaying an old-school flair for style, the 25-year-old law student at Drexel University walks around campus sporting a vintage Brooks Brothers three-piecer and authentic 1960s Florsheims, his trilby cocked just so.

The elegant look from another era makes a suave statement and exudes a certain authority — evoking equal parts image and lifestyle that a growing number of young men are hungry to adopt.

“I think it’s important to recognize that clothes don’t make the man,” said Mulvihill, who lives in Philadelphia’s East Kensington with his wife. “But a man of character and integrity who embodies traditional principles of etiquette will never be hurt by dressing well.”

Gentlemen, a “menaissance,” as one blogger describes it, is under way, and the classically clad “retrosexual” is leading the charge.

Think of him as the anti-metrosexual, the opposite of that guy who emerged in the 1990s in all his pedicured, moussed-up, skinny-jeans glory. That man-boy was searching for his inner girl, it was argued. The retrosexual, however, wants to put the man back into manhood.

In other words, the boy wants to grow up, trading adolescent behaviors — working in a coffee shop, hanging with girls instead of dating them, and worrying about his hair — for a man who can take care of business, according to Josh Weil, cofounder of Youth Trends in Ramsey, N.J., who has tweeted about the macho-man look.

“I’m a strong guy, I’m very comfortable with who I am, I’m carrying around a little attitude,” he said, describing the philosophy.

Say goodbye to the sensitive guy who cries at the drop of a pink tee, or the slacker living with his mother, playing video games. This new man has ambition and aplomb, brawn and brains.