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11. Her Engagement Dress
Another famous look was this blue Issa dress Kate wore to announce her and Prince William's engagement back in 2010 after spending holiday together in Kenya.

The dress was so popular, however, that it contributed to the downfall of the fashion brand that created it. In an interview with the Daily Mail, Helayel revealed the high demand for her designs turned out to be disastrous for her business. With sales doubling and a 25-person staff, Helayel wasn't able to keep up with the demand.