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"If you imagine your eyes and brain are like a camera, it might set to the setting of outdoor and then it processes the visual information in one way - or it might be set to indoor and then it processes information in a different way," explains Marie Rogers, who researches cognition and colour perception at the University of Sussex

But when the bride-to-be posted the picture on Facebook, a disagreement erupted over the colour of the outfit: some said it was white and gold, while others insisted it was blue and black

If you dont own a black suit, alternative dark colours such as charcoal or dark blue can work

A respectable widow was expected to wear full mourning dress for at least two and a half years after her husband's death