Mishkat al-Masabih 22 Clothing كتاب اللباس 30

وَعَنِ ابْنِ عُمَرَ قَالَ: كَانَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ إِذَا اعْتَمَّ سَدَلَ عِمَامَتَهُ بَيْنَ كَتِفَيْهِ. رَوَاهُ التِّرْمِذِيُّ وَقَالَ: هَذَا حَدِيثٌ حَسَنٌ غَرِيبٌ

Ibn ‘Umar told that when God’s messenger put on a turban he let the end hang between his shoulders. Tirmidhi transmitted it, saying this is a hasan gharib tradition.