Today, the Venezuelan-born designer turns 75, which seems like a good reason to appreciate her classic, elegant style. Herrera has made a mark on American fashion by dressing everyone from First Ladies Michelle Obama and Jackie Kennedy Onassis to Academy Award winners like Sandra Bullock and Renée Zellweger. Though her designs have evolved since her first collection debuted in 1981, her personal style has largely remained consistent: the crisp white shirt, often cuffed at the sleeves, has become a part of her iconic uniform. A Studio 54 regular in her heyday, Herrera consistently makes elegance look effortless, giving a pair of denim jeans the same refined style as a conservative floor-length gown. Take a look back at some of the designer's best style moments in honor of her 75th birthday.