It is narrated from Sayyidah Asma bint Abi Bakr (may Allah be pleased with her) that she heard the Messenger of Allah (peace and blessings be upon him) say to the women from the pulpit: "Whoever among you believes in Allah and the Last Day, let her not raise her head until the men have raised their heads." Sayyidah Asma (may Allah be pleased with her) said: "Because in those days there was hardship among the people, so they wore garments that were too short for them, and their private parts would become exposed."
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 20634