Praise be to Allaah Alone, and peace and blessings be upon him after whom there is no Prophet.
If a woman comes to the mosque wearing improper hijab, then according to Islam she should be advised and have explained to her – with the daleel or proof – the fact that hijab is obligatory, and the seriousness of neglecting it. If she then complies, then praise be to Allah. If she does not comply, then do not let her enter, because of the fitnah (temptation) and evil involved in her actions. The Prophet (peace and blessings of Allaah be upon him) said: “Any woman who has put on bukhoor (incense, fragrance) should not attend this ‘Isha’ prayer with us.”(Reported by Muslim, 675). And he (peace and blessings of Allaah be upon him) said concerning women’s going out to the mosque: “Let them go out unperfumed” (reported by Abu Dawood, 478), i.e., not wearing any perfume. Women have to go out wearing complete Islamic hijab, and not wearing adornment or perfume. And Allaah knows best.