Merry Christmas everyone!
The caption to this picture describes these costumes as "Advanced In Appearance, But Really Conservative In Cut". Clearly the fashions that were coming in during the 1910s made some women uneasy - which is fair enough, because here we see the beginning of a fashion revolution. The most obvious change is the lack of conspicuous corsetry (though women did in fact wear figure moulding "foundation garments" well into the 1960s). For nearly a century women had given themselves artificial "hour-glass" figures by wearing tightly-laced corsets. By 1914, however, this had given way to a more "natural" look - albeit a youthful one which older women had to work to maintain!