The company also report a link to the factory list however unable to open.

pg. 2

"BESTSELLER has no ownership interests in the production chain but cooperates with selected suppliers, primarily in China, India, Bangladesh, Turkey and Italy."

...

"By end 2020, we worked with 386 suppliers and 653 factories in 24 countries, primarily in Asia and Europe. We sourced from 24 different countries and we have sourcing offices in five main production countries."

Although the link is unable to open, their Factory List is available in their homepage and it was updated in April 2021.

https://about.bestseller.com/media/3414/bestseller-factory-list-may-2021.pdf