Maybe all the Pol Pot costumes were taken. It's hard to imagine what made dressing up as a Nazi seem like a good idea to PRINCE HARRY, 20, who appalled Britons by wearing a swastika armband to a party this month. Though the young royal issued a statement saying "It was a poor choice of a costume, and I apologize," Jewish groups called for him to show more contrition and attend a ceremony at Auschwitz on Jan. 27. This isn't the first time Harry's blunders have embarrassed the royal family. Last fall he socked a photographer outside a club; in 2002 he got caught smoking pot. Maybe, like the Prince Hal in Shakespeare's Henry IV, he's just setting himself up for a dramatic last-minute reformation. But then who will make Prince William look good?