What is an unraveling line in a nylon stocking called?

Complete the saying about missing the big picture: "You can't see the ___ for the trees." Which number links an unlucky Friday and a baker's dozen? In a German-speaking household, which title was traditionally used for an unmarried young lady? What is an unnecessary, wasteful or fraudulent project, especially one paid for with public money, called? What is an unreasonable fear or hatred of foreigners called? Which word describes an unsophisticated young woman, or a play's young heroine? Which French playwright wrote "Tartuffe", the 1664 comedy about a religious hypocrite? What is an X-ray image of blood vessels, made using a contrast dye, called?