Princess Diana often defied royal dress protocol, but she always did so in an elegant and empowering way. In June 1994, she wore an off-the-shoulder, form-fitting, black silk dress that has become known as the "revenge dress," and has gone down as one of the most iconic fashion moments of all time. We couldn't quite find the perfect Zara match, but this Bustier Dress (£110) is just as sultry, elegant, and feminine.