She mentioned women's hems to the Messenger of Allah [SAW], and the Messenger of Allah [SAW] said: "Let it down a hand span." Umm Salamah said: "But that will uncover (her feet)." He said: "Let it down a forearm's length, but no more than that." (Using translation from Nasāʾī 5337)
أَنَّهَا ذَكَرَتْ لِرَسُولِ اللهِ ﷺ ذُيُولَ النِّسَاءِ فَقَالَ رَسُولُ اللهِ ﷺ «تُرْخِي شِبْرًا» قَالَتْ أُمُّ سَلَمَةَ إِذًا يَنْكَشِفُ عَنْهَا؟ قَالَ «تُرْخِي ذِرَاعًا لَا تَزِيدُ عَلَيْهِ»