Anonymous6: From the Wiki page on "Bindi (decoration)":
Modern use: Bindis are worn throughout South Asia, specifically India, Bangladesh, Nepal, Sri Lanka and Pakistan, by women and girls, and no longer signify age, marital status, religious background or ethnic affiliation.
So there, Harry Potter is set in modern times. Thus, girls like Padma and Parvati can wear 'em if they want (or if the pervy artist drawing them wants).
Modern use: Bindis are worn throughout South Asia, specifically India, Bangladesh, Nepal, Sri Lanka and Pakistan, by women and girls, and no longer signify age, marital status, religious background or ethnic affiliation.
So there, Harry Potter is set in modern times. Thus, girls like Padma and Parvati can wear 'em if they want (or if the pervy artist drawing them wants).