“You must be a great sorceress.” “Why?” asked the girl. “Because you wear silver shoes and have killed the Wicked Witch. Besides, you have white in your frock, and only witches and sorceresses wear white.” “My dress is blue and white checked,” said Dorothy, smoothing out the wrinkles in it. “It is kind of you to wear that,” said Boq. “Blue is the color of the Munchkins, and white is the witch color.