As we're known, we can't judge people by their clothing . Because the clothes do not reflect what is inside the human. And often the clothing is the opposite of the truth of the person. And what is in his mind and his heart can't be known by us easily.
Person has its own style and some people don't have possibility to buy such expensive clothes as some others. We can judge people by their character,behavior, but not by the clothes they wear.
I think if you juge a person by his cloths you only can get his taste of cloths, but taste of cloths not equal to the taste of life So, we can't judge a person by appearance.