Hadith 4334
وَعَن أم سَلمَة قَالَتْ لِرَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ حِينَ ذَكَرَ الْإِزَارَ: فَالْمَرْأَةُ يَا رَسُولَ اللَّهِ؟ قَالَ: «تُرْخِي شِبْرًا» فَقَالَتْ: إِذًا تَنْكَشِفُ عَنْهَا قَالَ: «فَذِرَاعًا لَا تَزِيدُ عَلَيْهِ» . رَوَاهُ مَالِكٌ وَأَبُو دَاوُد وَالنَّسَائِيّ وَابْن مَاجَه
When God’s messenger mentioned the lower garment Umm Salama asked what a woman should do and he said she should let it down a span. She replied that in that case she would not be completely covered, and he said she might let it down a cubit, but no more. Malik, Abu Dawud, Nasa’i and Ibn Majah transmitted it.