You can do some research online to find sustainable fashion brands. Check out websites like Sustainlify, which curate sustainable fashion brands for you. You can also look for certifications such as GOTS (Global Organic Textile Standard) or Fair Trade Certified, which indicate that a brand is committed to sustainability and ethical production.

Another way to find sustainable fashion brands is to shop secondhand. By buying clothes that have already been produced, you're keeping them out of landfills and reducing the demand for new clothes. Check out secondhand stores, thrift shops, or online platforms like Depop or Poshmark.