Fast Retailing Co., the operator of casual clothing chain Uniqlo, said Wednesday it will open the world's largest Uniqlo flagship store in Shanghai on Sept. 30.

The store will also offer some Uniqlo family brands. It will be housed in a building at the site of a former department store, occupying the first five floors and a basement level, it said.

The store's 8,000-sq.-meter retail space is much larger than the Uniqlo flagship store in Tokyo's Ginza district that is currently the world's largest, with retail space of about 5,000 sq. meters.

The outlet will offer four Fast Retailing-owned brands, including the low-cost clothing line GU, and the French casual label Comptoir des Cotonniers, it said.

At the end of July, Fast Retailing had 210 stores in about 50 cities in China. The company "plans to increase the number of stores at a rate of 80 to 100 outlets per year," a Fast Retailing official in charge of China operations said Wednesday.