h and m white dress H&M | Dresses | Hm lace insets at the waist and smocking at the back Women's White Cotton Dress with

Erivos strapless dress was given another dash of drama thanks to the floor-length opera coat that she left draped around her elbows

Dressy flats can be elegant if they are pointed, satin, embellished, or metallic

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However, its safe to assume that a smart-but-casual outfit will be acceptable

Getty Images 1 Princess Diana (1994) Anwar Hussein Images On the same night that a then-Prince Charles confessed to adultery on national television, Princess Diana stepped out in a stunning black dress from Christina Stambolian that ensured she was the one grabbing all the headlines