DESIGNER AZZEDINE ALAIA

Models Naomi Campbell and Stephanie Seymour pulled out of attending the 2009 Gala at the last minute, in a show of support for designer Azzedine Alaïa. After he found out that none of his work was included in the Costume Institute exhibit, Alaïa asked the models not to wear the dresses he had designed for them to the gala and they chose not to attend altogether. Alaïa was well-known for his close relationships with models so his exclusion from the "Model as Muse" exhibit was seen as a snub. He criticized Wintour (with whom he had a longtime feud) for having "too much power over this museum."

MADONNA

In 2016, Madonna, whilst channeling the theme "Manus x Machina: Fashion in an Age of Technology", provided one of the most controversial outfits in the gala's history. She appeared in an ensemble designed by Givenchy creative director Riccardo Tisci exposing both her breasts and buttocks. Madonna hit back on her official social media channels by stating "We have fought and continue to fight for civil rights and gay rights around the world. When it comes to women’s rights we are still in the dark ages. My dress at the Met Ball was a political statement as well as a fashion statement".

RIHANNA WEARING A PAPAL MITRE

The 2018 Gala had a Roman Catholic theme, and included Rihanna wearing a papal mitre. Critics on social media called it "blasphemous" and "sacrilegious cosplay", even though the Catholic Church lent more than forty papal vestments from the Vatican, and Cardinal Timothy M. Dolan attended. Kyle Smith argued that the Catholic Church was in fact "abetting the mockery of its symbols".