TOEHOLD: Marta Romagna, prima ballerina at La Scala, could have been mistaken for a model, with her lithe figure and perfect posture, sitting at the Blumarine show. Romagna will actually wear Anna Molinari's designs — but not on a runway. Molinari has designed Romagna's costumes for "Romeo and Juliet," which will come to the U.S. in June and return to La Scala the following February. "She has a delicate touch, and her costumes really work on stage," said Romagna. That's no surprise: Molinari is honorary president of La Scala's ballet school.