The fast fashion giant Shein has taken the world by storm and is now worth an estimated $66billion. But have you ever wondered where their clothes come from? The BBC’s China correspondent Laura Bicker has been to Panyu, in the city of Guangzhou in China, to find out. She tells us how Shein became so successful, why some people in their factories are working 75 hours a week, and what Shein is doing to try to improve its manufacturing practices.

Many people choose fast fashion because of cost. We also speak to fashion blogger 17 year old Onyeka Idiaghe about why she eventually decided to seek alternatives.

Instagram: @bbcwhatintheworld