Student overalls
Many universities in Sweden have student overalls! At my uni they are worn to "ugly" events, events where maybe you sit on the ground or there will be food fights, and particularly worn when welcoming new students at the start of each year! The color of the overall represents what you study, and the patches represent drinks, events or dinners you've attended, or just something you thought was cool.There are a lot of weird and varying customs with these. You are only allowed to wash it if you are wearing it at the same time, you can only sew patches on by hand, and you can cut off parts to swap with people you meet from other degrees or schools!Most people's are covered in patches, and mine is halfway there (these are taken last year when I had just started)
Author Withheld (Age out of range)