Student revellers celebrating Hallowe'en have been told not to wear Mexican 'Day Of The Dead' costumes for fear of causing offence. Officials have been posting warnings to university undergraduates telling them to avoid cultural appropriation in what they wear ahead of this weekend's festivities. Among them is Robert Gordon University in Aberdeen, whose Student Union announced: 'Among the horror movies, the darker evenings and the creepy decorations, there is the scariest thing of all: offensive costumes.' They said Mexican outfits should not be used and neither should the sugar skulls made famous by Mexico's Día de Muertos, also known as...