Riyad as-Salihin: The Book of Dress – Hadith No. 120 — Ibn ‘Umar (May Allah be pleased with them) reported: My lower garment was… (Hadith No. 120)

Ibn 'Umar (May Allah be pleased with them) reported: My lower garment was trailing as I passed by the Messenger of Allah (ﷺ) so he said, "Raise your lower garment, Abdullah." I lifted it up and he told me to raise it higher. I complied with his orders and as I was still trying to find the best place (for it), one of the people asked where it should reach and he (ﷺ) replied, "Half way down the knees.".

Explanation:

Reference: Riyad as-Salihin, The Book of Dress, Hadith No. 120