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Breast binding
Flattening breasts with undergarments / From Wikipedia, the free encyclopedia
Breast binding, also known as chest binding, is the flattening and hiding of breasts with constrictive materials such as cloth strips or purpose-built undergarments. Binders may also be used as alternatives to bras or for reasons of propriety.
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People who bind include women, trans men, non-binary people, and cisgender men with gynecomastia.