What should I wear underneath my graduation robes?

Graduation is a formal occasion and we recommend that you wear a suit or similar formal outfit underneath your robes. Graduands are very welcome to wear national dress. Members of the armed forces may wear the appropriate uniform and member of religious orders their normal mode of dress. Please be aware that jeans, hoodies, tracksuits, trainers, flip flops, shorts and short skirts are not appropriate for the occasion.