What does it take to be able to do business on a Sunday? Ask Louis Vuitton. The luxury retailer's revamped flagship store on the Champs Elysées has been attracting thousands of visitors every day since it reopened last October. But last week, a Paris tribunal

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nginx/1.14.0 (Ubuntu) ruled that the luxury-goods firm has been breaking the law by opening its huge, 1,800-sq-m emporium on Sundays, one of its most heavily trafficked days.

Although much Sunday trading is banned in France, Louis Vuitton had received an exemption from the Paris prefect by arguing that the store was a...