Sayyidah Aishah (may Allah be pleased with her) says: Riders used to pass by us while we were with the Messenger of Allah (peace and blessings be upon him) in the state of ihram. When they came alongside us, each of us would let her outer cloak hang down from her head over her face, and when they had passed us, we would uncover our faces.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 9051