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An otherwise pleasant stroll up Madison Avenue one recent Sunday turned into a 1970s flashback for Ralph Auriemma, the creative director of classic-suit purveyor Paul Stuart. Gazing into the windows at Prada’s New York store, Mr. Auriemma saw male mannequins clad in bell-bottom corduroys, fur belts and fuzzy angora sweaters, all hallmarks of that stylistically divisive decade. “The ’70s were probably the most horrific, ugliest era of menswear ever assembled,” said Mr. Auriemma, who was a teenager when Journey ruled the airwaves. “I remember polyester flared pants, platform cork shoes and bold, obnoxious patterns…