No Bra Day is an annual observance on October 13 on which women are encouraged to go braless as a means to encourage breast cancer awareness.
No Bra Day was initially observed on July 9, 2011, but within three years it had moved to the 13th day of the National Breast Cancer Awareness Month, October.
No Bra Day is a female health holiday focusing on breast cancer prevention. It was created to raise awareness of breast cancer, promote self-examination, and early detection.
Accoding to a research If women typically wear a bra daily, going for few weeks without the garment, even if 24/7, definitely won’t have a significant effect. Aside from sagging, there’s also the issue of back pain
For large-breasted women, wearing a bra can help with back pain, as well as posture.