You may have a years-old bra, now slightly stretched or discoloured, that you love for how comfortable it is. You might also have a bra you've been unable to wear more than once because it doesn't feel right - maybe the wires poke into your skin, or there's too much padding.
This is a companion discussion topic for the original article at https://patient.info/news-and-features/is-your-bra-harming-your-health