“Bloomers” were introduced at a Women’s Rights Convention that opened on July 19, 1848, in Seneca Falls, New York. Named after one of this article of clothing’s chief promoters, Amelia Bloomer, a women’s rights activist, the basic idea was to tastefully allow women a stylish and modest freedom of movement (the dresses of the day were notoriously constricting). The style did not exactly catch on, and it would be a long time before women would be allowed, by cultural convention, to wear pants.
Cartoon image is from 1851, entitled “Woman’s Emancipation.”