The Crown’s fourth season, premiering November 15, gets to some of juicier portions of royal history. Namely, the courtship and marriage of Princess Diana and Prince Charles. The show’s upcoming portrayal of the royal wedding is one of the most highly anticipated TV moments of the year. While we wait to see actress Emma Corrin (playing Diana) in the recreation of that amazing wedding dress, it’s only appropriate to look back on Princess Diana’s actual gown.

Designed by husband-and-wife team David and Elizabeth Emanuel, Princess Diana’s ivory taffeta gown was intricately embroidered with sequins, frilled lace, and 10,000 pearls, putting the value of the gown at an estimated $115,000. A stunning display of style and grandiosity, the gown has sparked multiple copycat dresses over the years and remains one of the most iconic royal gowns.

Declared the “most closely guarded secret in fashion history,” the wedding dress was a complete mystery until its dramatic unveiling on Princess Diana’s wedding day. Now, here’s a look back at all the details of Diana’s now-iconic wedding gown and how she managed to stun thousands with her wedding-day ensemble.