Eccentric banking heir, musician and faux superhero “Sir” Ivan Wilzig will hold his annual racy Hamptons bash with an edgy nautical theme. “It’s pretty naughty,” the party animal (who has never been knighted so is not entitled to be called “Sir”) told us. “It’s called the Sailors and Sinners Soiree. The men are going to have to come in all white including a white sailor’s cap and all the women are going to have to come as burlesque dancers with a feather boa . . . I’m going to take the whole castle and turn it into a cruise ship.” Five hundred invitations are being sent out for the party on Sept. 1 at Wilzig’s Water Mill castle for those who have donated sizable funds to his Peaceman Foundation.