Which celebrity revived their struggling clothing line by completely rebranding it as a luxury athleisure brand, resulting in a billion-dollar business turnaround?

In the world of retail, celebrity-backed brands can face dramatic rises and falls. Sometimes a failing product line needs the right strategy to turn things around. This trivia question focuses on one of the most remarkable product revival stories in celebrity business history, where innovative retail psychology and strategic rebranding transformed a failing company into a billion-dollar empire.

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Jessica Simpson with The Jessica Simpson Collection
Kanye West transforming his Pastelle line into Yeezy
Rihanna with her Fenty Sport expansion
Jay-Z rebranding Rocawear as an upscale sportswear line