Concerns include the use of vague language which may suggest clothes are more eco-friendly than they are.
The CMA's move is part of an ongoing investigation into potential "greenwashing", when firms brand something as sustainable when this is not the case, and follows concerns about the way the companies' products are being marketed as eco-friendly.
the criteria used to decide which products to include in these collections may be lower than customers might reasonably expect from their descriptions - for example, some products may contain as little as 20% recycled fabricthere is a lack of information provided to customers about the products included, such as what the fabric is made from
Sarah Cardell, interim chief executive of the CMA, said: "People who want to 'buy green' should be able to do so confident that they aren't being misled. Eco-friendly and sustainable products can play a role in tackling climate change, but only if they are genuine."
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