Fast Retailing said its Uniqlo unit filed a lawsuit in Japan against the operators of Shein, claiming the Chinese fashion company copied its round mini shoulder bag.

The petition was filed on December 28 in the Tokyo District Court against Roadget Business Pte, Fashion Choice Pte, and Shein Japan, Fast Retailing said in a statement.

The Japanese company is seeking “immediate cessation of sales of the imitation products and compensation for damages incurred,” it said.

The round mini bag sells for 1500 yen ($10.27) in Japan, according to Uniqlo’s web site.

Fast Retailing, Japan’s biggest clothing seller, has more Uniqlo outlets in China than in its home market.

A Shein representative did not immediately respond to a request for comment.

• Reporting by Rocky Swift; Editing by Jacqueline Wong, of Reuters.