No Bra Day is observed worldwide every October 13, primarily to promote awareness of breast cancer and the importance of early detection. The event encourages women to go braless for at least one day, allowing them to experience the discomfort that ill-fitted bras can cause, which may prevent them from noticing early signs of breast cancer. The inaugural No Bra Day was initiated by an anonymous internet user in July 2011, but it was officially moved to October in 2013 to align with Breast Cancer Awareness Month. Participants are also encouraged to wear purple if they cannot go braless, showing support for the cause. The day also emphasizes bodily autonomy and protests against the sexualization of female breasts and body shaming. Furthermore, it is linked to BRA Day, which focuses on breast reconstruction awareness following mastectomy.