باب ما جاء في صفة إزار رسول الله صلى الله عليه وسلم
17  
The Lungi Of Rasoolullah
Ash-Shama'il Al-Muhammadiyah 119
Al-Ash'ath ibn Sulaim said:
"I heard my maternal aunt relate, on the authority of her paternal uncle; 'While I was walking in Medina, someone behind me said: ‘Raise your loincloth, for that is more pious and conducive to longer wear.’ Lo and behold, he was Allah’s Messenger (Allah bless him and give him peace)', so I said: ‘O Messenger of Allah, it is simply a black garment with white stripes!’ He said: ‘Do you not have an example in me?’ so I looked and noticed that his loincloth was to half his shins'.”
حَدَّثَنَا مَحْمُودُ بْنُ غَيْلانَ، قَالَ‏:‏ حَدَّثَنَا أَبُو دَاوُدَ، عَنْ شُعْبَةَ، عَنِ الأَشْعَثِ بْنِ سُلَيْمٍ، قَالَ‏:‏ سَمِعْتُ عَمَّتِي، تُحَدِّثُ عَنْ عَمِّهَا، قَالَ‏:‏ بَيْنَا أَنَا أَمشِي بِالْمَدِينَةِ، إِذَا إِنْسَانٌ خَلْفِي يَقُولُ‏:‏ ارْفَعْ إِزَارَكَ، فَإِنَّهُ أَتْقَى وَأَبْقَى فَإِذَا هُوَ رَسُولُ اللهِ صلى الله عليه وسلم، فَقُلْتُ‏:‏ يَا رَسُولَ اللهِ إِنَّمَا هِيَ بُرْدَةٌ مَلْحَاءُ، قَالَ‏:‏ أَمَا لَكَ فِيَّ أُسْوَةٌ‏؟‏ فَنَظَرْتُ فَإِذَا إِزَارُهُ إِلَى نِصْفِ سَاقَيْهِ‏.‏
Grade: Da'if isnad (Zubair Alizai)  إسناده ضعيف   (Zubair Alizai) حكم   :
Reference : Ash-Shama'il Al-Muhammadiyah 119
In-book reference : Book 17, Hadith 2
Explanation
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We have been warned strictly in the ahaadith on the wearing of a lungi or trousers below the ankle. All those parts that droop below the ankles will be burnt in the fire. Abdur-Rahman says, "I asked Abu Saeed Khudri radiyallahu anhu regarding the lungi. He replied, "You have a very meaningful question. Rasoolullah sallallahu alaihe wasallam has said, "The lungi of a Muslim should reach till the middle of the shin, and there is no harm if it reaches above his ankles. But those portions that droop below the ankles will burn in the fire of jahannam. The one that lets his clothes droop below his ankles in pride, Allah Most High will not look at him on the Day of Judgement." (Abu Dawud).

Warnings like these have been given in other ahaadith too. One should take strict care of this. In our time it has become a fashion to let the clothing droop below the ankles, so much so, that we treat it to be something petty and pay no heed to the warning of Sayyidina Rasoolullah sallallahu alaihe wasallam. To Allah is our complaint.
Hadith Text
Reference