Shein Group Ltd. has begun offering other fashion brands access to its apparel manufacturing network in China as a service, according to people familiar with the matter, as it seeks new revenue streams amid pressure on its retail business from U.S. tariffs.

Other fashion brands can now tap into the fast-fashion retailer’s supply chain—which includes factories that can turn around new designs in five to seven days—as long as they open a store on its online marketplace, said the people, who asked not to be identified as they are not authorized to speak publicly.

Shein began formally recruiting brands to join the initiative in the past two months, following nearly two years of preparation and testing, the people said. Around 20 brands, including French fashion label Pimkie and Filipino d

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