In 1962, all Grosset & Dunlap books become "picture covers", books with artwork and advertising printed directly on their covers, as opposed to books with a dust jacket over a tweed volume. The change was to reduce production costs. Several of the 1930s and 1940s cover illustrations were updated by Nappi for this change, depicting a Nancy of the Kennedy era, though the stories themselves were not updated. Internal illustrations, which were dropped in 1937, were returned to the books beginning in 1954, as pen and ink line drawings, mostly by uncredited artists, but usually corresponding with Nappi's style of drawing Nancy on the covers. Nappi followed trends initiated by Gillies and often illustrated Nancy wearing the same clothing more than once, including a mustard shirtwaist dress.