bloomers
US /ˈbluː.mərz/
UK /ˈbluː.mərz/

1.
women's loose trousers gathered at the knee or ankle, formerly worn for cycling or other sports.
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Victorian women wore bloomers for exercise.
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She found a pair of antique bloomers at the vintage shop.
2.
a type of underwear, typically for women or children, that is loose-fitting and gathered at the leg openings.
:
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The baby wore cute little bloomers under her dress.
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She changed into her comfortable cotton bloomers for bed.