Parker had studied fashion illustration, and Mopsy always had a stylish look. During World War II, Mopsy held such wartime jobs as a nurse and a munitions-plant worker, and the feature grew in popularity. With the Sunday strip, added in 1945, Parker was able to expand her fashion concepts into a sidebar series of paper dolls. After WWII ended, Mopsy was fired from her defense job in 1947 and went back to civilian life. By the end of the 1940s, Mopsy was published in 300 newspapers.