In this case, it's the parents that are to be blamed, your child brought something to a house that isn't hers and they still allowed the child to wear that same thing to school with someone's name written on it, "No na"

Who knows if the child hid the cardigan in her bag and wore it the next day, but then at that early stage, it isn't nice, I feel parents should put an extra eye on their children, this particular act can be described as stealing.