For a modern take on a witch costume this Halloween, think simple. Simply stitch black chiffon or net to the sleeves of a gym leotard and wear with vampy accessories: oversized fedora and platform heels.
This… this is like Manwë and his brother Melkor sitting together. When? I don't know. But it's pretty awesome still. (The odds are that these are women, but hell, the Valar could look however they wanted so booyah.)