informal knickers
a costume worn formerly by women and children, consisting of a short skirt and long loose trousers gathered closely about the ankles
full loose knickers gathered at the knee, formerly worn by women
full loose trousers gathered at the knee, formerly worn by women, esp for athletics
an undergarment of similar design
[orig in sense 2: named after Amelia Bloomer d.1894, US feminist, who advocated similar dress]