except seems china is the biggest polyester manufacturer though I'm not sure about the high end segment.

https://www.icis.com/asian-chemical-connections/2020/09/the-china-polyester-mystery-continues-in-a-world-turned-upside-down/

https://www.icis.com/asian-chemical-connections/2020/09/ah-i-see-chinas-booming-demand-mystery-a-little-closer-to-being-solved/