Blazers are a compulsory uniform item and should be worn at all times.

Senior students add the red trim to their blazer and Prefects have the extra white ribbing (as seen above). 

The school does not supply blazers for students who have forgotten their blazer and therefore it is their responsibility to wear it to school each day. Cardigans can only be worn if they are underneath the blazer. They are not to be worn instead of the blazer.