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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.
Users on social media are encouraged to post using the hashtag #nobraday to promote awareness of breast cancer symptoms and to encourage gender equality.
Some users on social media sites also encourage women to post pictures of themselves not wearing a bra. Some women embrace No Bra Day as a political statement while others prefer the comfort of discarding what they view as a restrictive, uncomfortable garment.
The observance has spread worldwide. The event was spun off a medical event in Toronto, Canada, that encourages breast cancer survivors to consider reconstructive surgery.
First held on October 19, 2011, the medical event was named BRA (Breast Reconstruction Awareness) Day. It was adapted by an anonymous individual who conceived of No Bra Day as a way to encourage women to enjoy being braless and to become knowledgeable about breast cancer symptoms.
The day is controversial as some see it as sexualizing and exploiting women's bodies while at the same time belittling a serious disease.