London —

What could be more British than standing in a muddy tent as the sun sets on a cool end-of-summer evening? This was the scene at Burberry’s show in London on Monday — a headline event that always closes the city’s fashion week.

While the mud was fake and the surrounding fields were actually Kensington Palace Gardens, the brand was channeling one of Britain’s greatest cultural offerings, the festival, in a night designed to celebrate both music and fashion.

And there was certainly cause for celebration for the heritage label. Earlier that day, the company rejoined the FTSE 100 index, which brings together 100 of the most valuable companies on the London Stock Exchange, one year after it dropped off the list during a particularly challenging financial period for the brand.

The

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