Left: from McCall's 1911

Left: Ladies Home Journal 1909. For the Girl Who Makes her Own Clothes (which would be most of their readers)…"Fashion is playing into the hands of the economical girl this season as the evening dress shown in this picture requires no trimming, the pretty corded puffing being quite sufficient. For a simple party or graduation dress chose China silk, mull or silk organdy; for housewear a light coloured crepe de Chine." The silhouette slimmed down in 1908-1913 becoming more girl-like and hinting at trends to come. With 30 percent of young women working, style could cater to unmarried women -not only matrons. Click here for SLIDESHOW of real 1910 women and their fashions

And how did they get that svelte silhouette? By wearing corsets. Here's a rust proof one. During WWI women donated their corsets to the war cause.