Around 40 pieces of rare ecclesiastical fashion will be displayed at the upcoming Costume Institute exhibition - many of which have never left the Vatican before.
Pieces include a papal tiara with 18,000 diamonds and items worn by Pope Benedict 14th in the 1600s, according to The Guardian.
Guests will arrive to the New York annual fundraising gala dressed in their - or their chosen designer's interpretation of the religion.
Known as the Oscars of the fashion industry, the 'Heavenly Bodies: Fashion and the Catholic Imagination', is expected in usual fashion to attract a wide range of stars.
The Metropolitan Museum of Art hosted a press presentation in Rome on Monday, lead by curator Andrew Bolton.
He was joined by American Vogue editor-in-chief, Anna Wintour, who is also a trustee of the museum.
Speaking about the exhibition, Wintour said "I want [red-carpet guests] to understand the importance of the exhibition. "Of course the party is always fun and it's great to see what everyone is wearing, but [it serves] to put the spotlight on the exhibition.
But this isn't the first time attendees of the Met Gala have seen Vatican pieces on display.
The Vatican last lent pieces to the Met for The Vatican Collections exhibit in 1983.
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