Mishkat al-Masabih 4325
Asma’ daughter of Abu Bakr brought out a mantle of royal Persian quality with a gore of brocade and hemmed front and back with brocade, and said :
This was God’s messenger’s mantle which was with ‘A’isha, which I inherited when she died. The Prophet used to wear it, and we washed it for the sick and sought a cure by means of it. (The water in which it was washed would be given to the sick to drink, or the garment itself was placed on them, or given to them to touch or kiss, and so receive a blessing) 
Muslim transmitted it.
وَعَن أسماءَ بنت أبي بكر: أَنَّهَا أَخْرَجَتْ جُبَّةَ طَيَالِسَةٍ كِسْرَوَانِيَّةٍ لَهَا لِبْنَةُ ديباجٍ وفُرجَيْها مكفوفَين بالديباجِ وَقَالَت: هَذِه جبَّةُ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ كَانَتْ عِنْدَ عَائِشَةَ فَلَمَّا قُبِضَتْ قَبَضْتُهَا وَكَانَ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَلْبَسُهَا فَنَحْنُ نَغْسِلُهَا للمَرضى نستشفي بهَا. رَوَاهُ مُسلم