No Bra Day is observed every year on October 13, in the middle of Breast Cancer Awareness Month.
The movement started in 2011 and largely takes place on social media, where women use the hashtag #NoBraDay to promote awareness of breast cancer symptoms and to encourage gender equality.
The objective is to raise awareness and encourage women to carry out self-examinations and screening.
Women who do not want to go braless take part by wearing purple for the day.
Ladies are encouraged to get a mammogram screening on October 13, which can help detect breast cancer up to two years before it can be felt by the patient or a doctor.
Why is No Bra Day celebrated?
No Bra Day was started in Toronto, Canada, by plastic surgeon Dr Mitchell Brown.
The aim of his original BRA (Breast Reconstruction Awareness) Day was to educate women about their choice for reconstruction when undergoing a mastectomy.
To date, BRA Day is being celebrated in over 30 countries worldwide.