It's #SecondHandSeptember, a campaign run by Oxfam encouraging people across the UK to stop buying new clothes for the month in a bid to cut back on fast fashion.
To tie in with their new campaign, we have chosen some of the best clothes swapping apps and websites in the UK which allow you to donate your unwanted items in return for some lovely second-hand options.
You can also get involved by signing up to Oxfam’s #SecondHandSeptember campaign and take the pledge to buy no new clothes for the month.
As well as swapping via a website or app, you can alternatively set up a clothes swap in your local area. Whether it's with a group of close friends or with a larger organisation, it's a great way to give your unwanted items a new home.
Take a look at the apps and websites below...