Stella McCartney attended King Charles III’s Coronation Concert on Sunday in Windsor, England. The designer performed an original spoken word piece about one in all the monarch’s favorite causes: conservation.

On the red carpet, McCartney sported an oversized plaid blazer from her own line. It debuted on the runway during London Fashion Week as a part of McCartney’s fall 2023 collection.

She wore the jacket, which features exaggerated shoulders, over faux leather leggings. The designer accessorized with a pair of black heeled booties.

On stage, McCartney become a vivid red version of the double-breasted blazer, which she styled over a black sheer polka-dotted tights.

McCartney is the daughter of Sir Paul McCartney and Linda McCartney, and is thought for not using leather, feathers, skin or fur in her collections. Her brand has been around since 2001.

McCartney and King Charles have worked together on environmental projects prior to now, and she or he was rewarded with a Commander of the Order of the British Empire honor.

The Coronation Concert, broadcast live at Windsor Castle by the BBC and BBC Studios, followed the coronation of King Charles III and Queen Camilla. The list of performers included Katy Perry, Lionel Richie, Andrea Bocelli, Sir Bryn Terfel, Take That, Freya Ridings and Alexis Ffrench. The show also featured a performance by The Coronation Choir, a bunch that recruited members from different choirs across the U.K., including refugee choirs, NHS choirs, LGBTQ+ choirs and deaf signing choirs.