Shein: Find out how the low-cost clothing is made in Chinese factories
With sales of £1.5 billion here in the UK, Shein is one of the biggest apps that sells a huge range of fashion items at cheap prices.
Many of the clothes are made in a city in southern China called Guangzhou.
The BBC's China correspondent Laura Bicker went there to speak to workers and find out how the company makes its cut-price clothing.