Dennis School Uniform ST. BARNABAS Catholic SCHOOL Uniform Program? Want to find out immediately when Dennis is having a sale? Sign up by clicking on this link to be notified of sales and other promotions through your email! Please click here to be directed to the St. Barnabas school uniform through Dennis Uniform. YOUR SCHOOL CODE: BASBBI Questions? Call National Customer Service toll-free at 800.854.6951 FREE.