Cheap clothes are great for keeping up with the latest trends, but they're not so good for the environment.
Making them produces carbon dioxide, which lots of scientists think is contributing to global warming.
And when unwanted clothes are thrown away, many of them end up in landfill sites.
Now some of the biggest shops in Britain have signed up to a campaign to cut the environmental problems caused by "fast fashion".
The plan by the government looks at the whole lifecycle of clothes, from when they're designed, to when they're thrown away.
The aim is to make the process more eco-friendly, and encourage recycling.
Clothes can end up in landfill sites
The campaign also tackles issues like fair trading, which means making sure the people that make the clothes have good working conditions, and get paid enough.
More than 300 shops and companies have signed up to the action plan.
Marks and Spencer, Tesco and Sainsbury's say they will increase their ranges of Fairtrade and organic clothes on offer, and will try and use fabrics which can easily be recycled.
Charities like Oxfam and the Salvation Army will open more shops selling high quality second-hand clothes, and new designs made from recycled material.