Must a woman's hijab be of a specific color? And must it completely cover the chest? And what is the ruling on colorful, concealing hijabs?

There is no specific color required for the hijab, nor does the garment need to be a single, uniform color. However, it must not be an adornment in itself that attracts attention. It must also cover the entire body, including the face and hands, according to the more preponderant opinion among scholars.