Sahih Muslim 556
Sahih Muslim · Book 5: The Book of Mosques and Places of Prayer · It is disliked to offer salat in a garment with markings
'A'isha reported:
حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ ، حَدَّثَنَا وَكِيعٌ ، عَنْ هِشَامٍ ، عَنْ أَبِيهِ ، عَنْ عَائِشَةَ ، أَنَّ النَّبِيَّ صلى الله عليه وسلم كَانَتْ لَهُ خَمِيصَةٌ لَهَا عَلَمٌ فَكَانَ يَتَشَاغَلُ بِهَا فِي الصَّلاَةِ فَأَعْطَاهَا أَبَا جَهْمٍ وَأَخَذَ كِسَاءً لَهُ أَنْبِجَانِيًّا .
The Apostle of Allah (way peace be upon him) had a garment which had designs upon it and this distracted him in prayer. He gave it to Abu Jahm and took a plain garment in its place which is known anbijaniya.