Al-Matalib al-'Aliyah 319 — Covering the awrah

It is narrated from Amrah (may Allah have mercy on her) that the Mother of the Believers, Sayyidah Aishah (may Allah be pleased with her), said: "A woman who has the means and ability (to wear three garments) must never perform prayer in fewer than three garments."
Imam Musaddad bin Musarhad narrated it in his Musnad. Its chain contains Muhammad bin Ishaq, who did not state explicitly that he heard it; however, on the basis of other supporting reports its meaning has been accepted, and from a fiqh perspective it indicates the importance of complete covering and precautionary measures for women in prayer.