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Thanks for replying Andy, I agree that respect for being in a court needs to be shown by dressing appropriately and I can imagine that there will be some men who just feel that it does not matter.
It is a female who is suing me and I know that she works in an administration office so she will be used to dressing smartly. I very much doubt she will turn up in any kind of dress down attire such as the coach driver you faced in court. Jeans, a tee-shirt and cardie, no wonder the magistrate was unimpressed!