When Princess Diana ascended the iconic steps at the Metropolitan Museum of Art in December 1996 for what would be her sole Met Gala appearance, she turned heads in a slinky navy blue column dress designed by John Galliano for Dior, complete with lingerie-like black lace straps and trim.

Princess Diana was known for pushing boundaries, especially when it came to fashion. One of the royal's most iconic looks — a lingerie-inspired slip dress that she wore to the 1996 Met Gala — was designed by John Galliano,

Princess Diana stepped out in a daring fashion ensemble during the 1996 Met Gala. Fashion designer John Galliano remembered being in shock when the late royal arrived at the event.

If you’re a fan of Princess Diana, or Met Gala history, or both, then you know that the late Princess of Wales attended the event only once, back in 1996. At the event, which paid homage to Christian Dior,