New York Welcomes Calvin Klein’s New Underwear Hunk and YouTube’s Tyler Oakley...Occasionally, and especially when one’s own gym visits have receded into the distant past, one finds oneself face-to-navel with greatness. In this case, the man on the plinth in the rose-gold metallic-leather pants, topless save for a gold amulet on a chain around his neck — this being, naturally, a presentation of what Calvin Klein was calling “formalwear” — was Mitchell Slaggert of Fayetteville, Ga. Mr. Slaggert, 21, is the new face (and chiseled body) of Calvin Klein Collection and Calvin Klein Underwear. He is recently enough removed from the American South that he peppers his conversation with “sir.” He was scouted, he said, some seven months ago, while walking to his car, and his dreams of working for the Department of Homeland Security were paused in favor of a spot on the Calvin Klein runway in Milan. In the months since, Mr. Slaggert has appeared in magazines (including the German edition of GQ Style and the Italian edition of Vogue), on more runways and in the ad campaign for DSquared2. But his Calvin Klein underwear campaign — for a new line called Iron Strength — may well be his biggest coup. He is preceded in this pants-dropping endeavor by the likes of Justin Bieber, Mark Wahlberg, Jamie Dornan and Kellan Lutz. In an email, Melisa Goldie, Calvin Klein’s chief marketing officer, praised Mr. Slaggert’s “raw masculinity” and “sense of athleticism.” In the flesh, a gee-whiz ingenuousness was just as much in evidence. How does he like modeling in his underwear? “It took some getting used to,” he said. “But I asked my sister, and she said: ‘You have to. It’s iconic.’” In the coming weeks, Mr. Slaggert will appear in the Iron Strength campaign, tussling with another up-and-coming young model: Kendall Jenner.