Notre Dame de Sion provides a dress code to promote an atmosphere conducive to learning, enhance personal pride and dignity, and project a positive school image to the community. The dress code helps us focus on the essential tasks at school, teaching, and learning. Students demonstrate their commitment to school spirit and community by following the uniform expectations.

For middle school and high school students, dress uniform is worn on special occasions, including all school masses, specific field trips, and ceremonies. Other special dress days are set aside once a season for athletic teams, clubs, cheer, and dance teams and other student organizations.

Notre Dame de Sion partners with Mills Uniform Company to provide durable, high-quality uniforms. Go to https://www.millswear.com to shop online and to review the approved uniform program listing. To place an order over the phone contact Mills Uniform Company's customer service at 800-541-1850. Notre Dame de Sion's school code is 3690.

Mill's Mobile Store visits the school twice a year.

High school students may purchase polo shirts and spirit wear the Sion Shoppe, located in the Commons on the high school campus.  At the grade school, spirit wear is sold through the Sion ALLiance parent organization.