Good lord, almost eight months...
I always wondered why government approved Canadian high visibility wear for construction required the striping on the back to be in an 'X' pattern, as opposed to the horizontal or vertical striping common elsewhere. Apparently, it is designed to let others know that if you're seeing the X, that means that worker has their back facing you. It is mostly to benefit heavy machinery operators, who would then know when all ground workers are facing the equipment in high noise and low visibility environments.