Narrated Umm Salamah (RA):

She asked the Prophet (ﷺ), "Can a woman pray in a long dress and a veil without wearing a lower garment?" He replied, "If the long dress is ample and covers the surface of her feet." [Reported by Abu Dawud and the Imams graded it Mawquf (a saying of Umm Salamah)].

وَعَنْ أُمِّ سَلَمَةَ ‏- رَضِيَ اَللَّهُ عَنْهَا‏- ; أَنَّهَا سَأَلَتْ اَلنَّبِيِّ ‏- صلى الله عليه وسلم ‏-{ أَتُصَلِّي اَلْمَرْأَةُ فِي دِرْعٍ وَخِمَارٍ , بِغَيْرِ إِزَارٍ ? قَالَ : "إِذَا كَانَ اَلدِّرْعُ سَابِغًا يُغَطِّي ظُهُورَ قَدَمَيْهَا } أَخْرَجَهُ أَبُو دَاوُدَ وَصَحَّحَ اَلْأَئِمَّةُ وَقْفَهُ .‏ [1]‏