a costume for women, advocated about 1850 by Amelia Jenks Bloomer, consisting of a short skirt, loose trousers gathered and buttoned at the ankle, and often a coat and a wide hat.

bloomers, ( used with a plural verb )

loose trousers gathered at the knee, formerly worn by women as part of a gymnasium, riding, or other sports outfit.

women's underpants of similar, but less bulky, design.

the trousers of a bloomer costume.

any of various women's garments with full-cut legs gathered at the bottom edge.

(of a woman's garment) having full-cut legs gathered at the bottom edge

bloomer shorts.