"Films are where style is immortalized," GQ style editor Adam Rapoport told the New York Daily News. "They're something everyone has access to."
The Top 25 list, in GQ's November issue, represents six decades of timeless looks, chosen by the glossy's editors.
Grant's impeccably tailored gray suit in Alfred Hitchcock's 1959 thriller "is arguably the most legendary in the history of American cinema," GQ said.
Other winners included Richard Roundtree's long leather coat in 1971's "Shaft" and Richard Gere's head-to-toe Armani in "American Gigolo."
Also cited were Al Pacino's form-fitting double-breasted suits in "The Godfather Part II" and Steve McQueen's thick wool turtlenecks and worsted wool trousers in the 1968 cop classic "Bullitt," GQ said.