Which major awards show first launched a sustainable fashion initiative requiring celebrities to wear only recycled, upcycled, or previously worn outfits?

The entertainment industry has increasingly embraced sustainability in recent years, with celebrities making bold statements through their fashion choices. From recycled materials to vintage outfits, Hollywood's elite have used their platform to promote eco-conscious consumption. This trivia question explores a groundbreaking sustainability initiative that changed how we view celebrity fashion and set new standards for red carpet events worldwide.

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The 2020 BAFTAs, where attendees received a sustainable fashion guide and were asked to rewear, rent, or choose vintage
The 2019 Met Gala, where the theme 'Camp: Notes on Fashion' required all attendees to use sustainable materials
The 2021 Oscars, which instituted a 'green carpet' policy requiring all outfits to have sustainable certification
The 2018 Golden Globes, where the Time's Up movement included a sustainability pledge for all black outfits worn