Provided by the U.S. Department of Commerce's International Trade Administration, Office of Textiles and Apparel. Download 2 files: imports in Units and in Dollars. On each spreadsheet, you will need categories 1 (apparel) and 2 (non-apparel). For more information, see OTEXA category numbers and definitions.
Commodity trade data provided by the United Nations. Download exports (from assigned country to USA) for clothing (84) and textiles (65). This database only allows you to download 5 years at a time. If you need 10 years of data, download the first five years and then download the remaining 5 years.