LONDON, Jan. 13 -- Now surely we've all faced this problem: We've been invited to a costume party at someone's country estate and nothing in the closet is quite right. What to wear? For Prince Harry, third in line to the British throne, here's the answer that came to mind: dress up as a German soldier, complete with army uniform and Nazi armband. Unfortunately for Harry, a redheaded 20-year-old with an ever-expanding reputation for bad judgment, someone at the party Saturday night took his photograph and sold it to the Sun, Britain's most carnivorous tabloid. The result was splashed across...