NEW YORK CITY — Topping Doyle’s June 27 single-owner sale of the estate of Oleg Cassini, best known for creating Jacqueline Kennedy’s signature style during her tenure as First Lady, was a rare Sixteenth Century suit of fluted armor in the Maximilian style that soared past its $20/30,000 estimate to bring $262,500. The result is an American auction record for European armor according to Doyle. The armor had been acquired by Cassini from the collection of Lord Astor in England’s Hever Castle.