In my country there is this thing with 'martiosare', I don't think there is any translation for this word. However,they are small things you can put on your t-shirt... it's easier if i put a pic
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Anyway, on my way to school I saw many womans who had them on their jackets,they were all pretty colored, and than I saw a man who had a black peace of material on his jacket. I don't know if it's the same in other cultures, but here that means someone you knew died, and you wear those things to show your respect for them after he/she died. I found it really weird, after all those happy colours ...