حَدَّثَنَا النُّفَيْلِيُّ، حَدَّثَنَا زُهَيْرٌ، حَدَّثَنَا عَاصِمٌ الأَحْوَلُ، عَنْ عَمْرِو بْنِ سَلِمَةَ، بِهَذَا الْخَبَرِ قَالَ فَكُنْتُ أَؤُمُّهُمْ فِي بُرْدَةٍ مُوصَلَةٍ فِيهَا فَتْقٌ فَكُنْتُ إِذَا سَجَدْتُ خَرَجَتِ اسْتِي

This tradition has also been transmitted through a different chain by ‘Amr b. Salamah. This version says

He said: "I used to lead them in prayer wearing a patched garment with slits in it, so when I prostrated, my buttocks would become exposed."