Founded in 2003, the UNIQLO UT line, originally referring to a cheap T-shirt with a popular cartoon image and brand logo, has transformed into a cultural symbol of young people's fashion since it started to collaborate with hundreds of designers from more than 100 companies, the report said.

At its Tmall online shop, T-shirts from the top 10 most popular UT lines have sold for tens of thousands of pieces respectively, the report added.

The Chinese mainland market has become the main driving force for the Japanese fast fashion company's overseas growth, a report by iyiou.com said.

A first half financial report of Uniqlo's parent company, Fast Retailing Co Ltd, showed its turnover increased by 80.9 billion yen, with almost 86.6 percent of the growth coming from overseas markets, especially the Chinese mainland.