Dying for a Bargain: Panorama investigates the human cost of cheap clothes
23 September 2013 Last updated at 01:21 BST
A BBC investigation has found factory workers in Bangladesh are working 19-hour shifts in dangerous conditions to make clothes for Western high streets.
Secret filming by Panorama discovered that some factories hide the long hours from retailers by keeping two sets of books.
Richard Bilton reports.
Viewers in the UK can see Panorama: Dying for a Bargain on BBC One at 20:30 BST, Monday 23 September.