The world of fashion has always traded on the desire of shoppers for the latest thing. Whether it's a new-season coat or a dress in an on-trend colour, the industry has been underpinned by consumers continuing to buy ever more clothing. Known as "fast fashion" this affordable but disposable approach to clothing has created billion dollar empires, but there is a cost. This investigation reveals the unglamorous, and in some cases illegal practices of the clothing industry. With millions of tonnes of textiles ending up in landfill, some in the fashion industry are challenging customers to change their buying habits.