In an exclusive interview with PEOPLE, the Chicago P.D. star, 64, reflected on the time he shot a major, 50-page ad campaign with designer Giorgio Armani for Italian magazine L'Uomo Vogue in 1980.

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In an exclusive interview with PEOPLE, the Chicago P.D. star, 64, reflected on the time he shot a major, 50-page ad campaign with designer Giorgio Armani for Italian magazine L'Uomo Vogue in 1980. "Oh ...