Well the Lawyers uniform is BLACK, because in olden days in West Country the fighter are forced to wear black T-shirt. So they will be easy identified as fighter. When lawyers businesses starts and people notice most of the lawyers are like fighter. They’re mourning. So the dressing code communities assign black color for the layer and police. This hatch behind the black color
Nurse wears White because when people start hearing story about the mercy angle is coming from the sky and its color is bright white. As we all know nurse is known as angle that treat people with mercy and tender. From this statement the white color was assigned for nurse Again the dressing code communities assign white color for the nurse. That’s what I have read long time ago
But honestly those days specially in USA & UK, worker wearing any cloth, just only they put tag on the cloth with their name and specialize
In generally there is no unique rule behind the color code for dressing or any logic behind it