Catherine, Duchess of Cambridge – Wikipedia

The “Kate Middleton effect” is the trend that the Duchess is reported to have had on others in sales of particular products and brands. [252] [253] In 2018, Brand Finance ‘s research cited the Duchess as “the most powerful royal fashion influencer”, retaining that pieces in her wardrobe increase desirability among 38 percent of American …

https://en.wikipedia.org/wiki/Kate_Middleton