The Prophet, salallaahu 'alaihi wasallam, allowed the women to go to the Mosques at 'Eeshaa time under the condition they go whilst adequately dressed - meaning, clothing that is not eye-catching or draws the attention [of people] and they are not perfumed.
Abu Hurayrah, radhi Allaahu 'anhu, said: Indeed the Prophet, salallaahu 'alaihi wasallam, said: "Any woman who leaves [her dwelling] perfumed, [seeking] that the men smell her, is a fornicator."
Translator's note: A'isha, radhi Allaahu 'anhaa, narrated: Allaah's Messenger, salallaahu 'alaihi wasallam, used to offer the fajr prayer and some of the believing women, covered with their veiling sheets, used to attend the fajr prayer with him, and they would return to their homes unrecognised. (Saheeh Al-Bukhaaree, English translation, Hadeeth No. 368, Vol 1.)