The duties on importing textiles are pretty steep. You can't use the 7523 form for that. I don't know the form number but I know you can't use that one. There are strict quotas for textiles and high duty rates.
Here is a link to the tariff codes that I just found in the wee hours this morning. Man what a pain that was! It not only has the codes it shows the rate of duty as well.
http://prototype.usitc.gov/tata/hts/bychapter/2005_supp.htm
Somewhere in there it might tell you the correct form. I had to go inside on one trip and was told that because some of my stuff was made in China, I can't use that form. I asked which one I was to use and he didn't really answer me. He charged me $6 import duties and sent me on my way.