It was in these (clothes) that Messenger of Allah ﷺ died. Ibn Hatim (one of the narrators) in his narration Wd: The lower garment of coarse cloth.
أَخْرَجَتْ إِلَيْنَا عَائِشَةُ إِزَارًا وَكِسَاءً مُلَبَّدًا فَقَالَتْ فِي هَذَا قُبِضَ رَسُولُ اللَّهِ ﷺ قَالَ ابْنُ حَاتِمٍ فِي حَدِيثِهِ إِزَارًا غَلِيظًا