How old are rules that guide dressing, decorum of doctors?
The earliest known expressions of medical code of conduct date back roughly 2,500 years called 'Hippocratic Corpus' associated with the Greek physician Hippocrates and his teachings. In the text titled Decorum, doctors are instructed to dress "simple, not over-elaborated, but aiming rather at good repute". Several parts of the ancient text are still practised for taking oath by modern-day doctors.