Hi Linda,
Thanks for posting this question here. We do have an article which mentions washing clothes before wearing to remove any formaldehyde which is used to prevent wrinkles: https://atopicdermatitis.net/living/beware-before-you-wear. Also, I did find this UK website where you can purchase clothes that do not contain formaldehyde: https://www.eczemaclothing.com/formaldehyde-free-clothing. I hope this is helpful to you in your search!
-Sarah (AtopicDermatitis.net Team Member)