Hukaymah narrated from her mother, Sayyidah Umaymah (may Allah be pleased with her), that the wives of the Prophet (peace and blessings be upon him) would make a headband containing wars and saffron, and before entering ihram they would tie it over the lower part of their hair at the forehead, and then enter ihram in that state.
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 20849