Photo taken on April 26 shows the outfits made of blue calico in Nantong City, Jiangsu Province. (Photo/CFP)

Nantong blue calico retains the 1,000-year-old printing and dyeing technique, which was recognized as a national intangible cultural heritage in 2006. The city is also known as the birthplace of China's modern national industry.

Photo taken on April 26 shows the outfits made of blue calico in Nantong City, Jiangsu Province. (Photo/CFP)

Photo taken on April 26 shows the outfits made of blue calico in Nantong City, Jiangsu Province. (Photo/CFP)

Photo taken on April 26 shows the outfits made of blue calico in Nantong City, Jiangsu Province. (Photo/CFP)

Photo taken on April 26 shows the outfits made of blue calico in Nantong City, Jiangsu Province. (Photo/CFP)

Photo taken on April 26 shows the outfits made of blue calico in Nantong City, Jiangsu Province. (Photo/CFP)

Photo taken on April 26 shows the outfits made of blue calico in Nantong City, Jiangsu Province. (Photo/CFP)