Commonly, the dress code to attend a graduation ceremony is quite strict, since it is a formal event that should be attended dressed and bathed, if possible. But this doesn’t work like this everywhere, since the traditions of each culture and school vary more than you can imagine.
Take the example of Kyoto University and the Kyoto University of the Arts in Japan, where students are officially allowed to dress however they want to receive their diploma. But the tradition has been taken too far, resulting in crazy and original outfits that you can’t miss.