Thirty minutes before the start of the Marc Jacobs show, the models were lined up and waiting. Mr. Jacobs, in a formal mood, was wearing a three-piece suit but had removed the jacket. Out front, where the floor and specially built walls were covered with brown cardboard, giving the aura of a giant box, guests milled around. The photographers, without celebrities to snap (none had been invited) were like chickens idly pecking around a barnyard.