Uniqlo is suing Shein over claims the fast-fashion retailer is selling bags that mimic its viral shoulder bag.

The legal case was filed in Tokyo and claims that some Shein bags “closely resemble” Uniqlo’s cross-body bags, which have gained millions of likes on social media platform TikTok.

The nylon shoulder bag has become the brand’s best-selling bag ever, the BBC reported.

Uniqlo is forecasting a record profit for 2024 but climate change is reportedly said to pose a challenge for sales of items such as its fleece jackets.

Uniqlo is concerned Shein’s bags could harm customer confidence in the brand and has demanded it cease selling its version of the bag immediately.

The Japanese retailer has also asked for “compensation for damages incurred”.

Fast Retailing, which owns Uniqlo, said a petition had been filed in the Tokyo District Court against Shein Japan and two subsidiaries in late December.

The case follows other legal battles that Shein has faced.

In December, online rival retailer Temu filed a lawsuit alleging “mafia-style intimidation” of suppliers as Shein is claimed to have “falsely imprisoned” workers after believing the suppliers were working for Temu.

Shein said of the case: “We believe this lawsuit is without merit and we will vigorously defend ourselves.”