Which fashion brand collaboration is widely credited with starting the high-fashion/fast-fashion crossover trend that became a retail phenomenon in the 2000s?

Brand collaborations have transformed the retail landscape, creating unique product offerings that capture consumer attention and generate buzz. Some partnerships have been so innovative they've changed how we think about cross-brand strategy. This trivia question tests your knowledge of a groundbreaking collaboration that redefined what was possible in the luxury-meets-mainstream space and created a template countless brands have since followed.

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H&M x Karl Lagerfeld (2004)
Target x Isaac Mizrahi (2003)
Gap x Stella McCartney (2005)
Uniqlo x Jil Sander (2009)