From Lupita's Prada blue to Cher's Bob Mackie beads — six ranked Oscar red carpet best dressed all time verdicts that still define Academy Awards fashion history decades after each ceremony night ended.

Lupita Nyong'o's powder-blue pleated Prada at the 86th Oscars tops most Oscar red carpet best dressed all time polls. The pleats caught step-and-repeat flash like liquid silk on her historic win night.

Cher's Bob Mackie beaded gown at the 46th Academy Awards broadcast fashion-as-performance into American living rooms. It remains the Oscar red carpet best dressed all time naked-dress reference every stylist cites.

Halle Berry's burgundy Elie Saab embroidery at the 74th Oscars paired couture craft with the first Black Best Actress win. The look anchors Elie Saab's Oscar red carpet best dressed all time origin story.

Billy Porter's Christian Siriano tuxedo gown at the 91st Oscars reshaped gender-fluid formalwear on Hollywood's biggest stage. A permanent Oscar red carpet best dressed all time menswear-and-skirt crossover landmark.