Items included in the tax-exemption: clothing, footwear, fabric, thread, yarn, buttons, zippers, neckties, scarves, hats, uniforms, athletic clothing, and diapers.
Items excluded from the tax-exemption: jewelry and watches, handbags, umbrellas, pet clothing, and sports equipment. There will be a winter tax-free week in New York from January 30-February 5, 2006.
For more information, check out the details, FAQ, and more on the NYC Finance website. You might also want to check out a complete list of nationwide Tax Free Weeks from the Federation of Tax Administrators.