I found this organic clothing site: [DLMURL]http://www.bluecanoe.com/index.asp[/DLMURL] Something like that might help. Just make sure that if you have a reaction you can return the items.
I get irritated by some fabrics. Not as bad as when I was younger. My son had the same issues. I feel everything I am going to be wearing to make sure it doesn't make me want to scratch. Elastic can not touch my skin or I'll end up with red marks, light welts.
You might want to pay attention to where it is made too. If it is made in the same country, it may cause similar issues if the treatments for the fabric are the same. I know it seems crazy, but I remember getting two t-shirts from the same company and, yet, they were made in different countries. One was definitely softer then the other. Odd but true. The only difference between the t-shirts was suppose to be the color.
I hope you find what is irritating you.