Riyad as-Salihin, Book 4, Hadith 800 (In-Book) ⓘ

Ibn 'Umar (May Allah be pleased with them) reported: My lower garment was trailing as I passed by Messenger of Allah 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 replied, "Half way down the knees."[Muslim].

وعن ابن عمر رضى الله عنهما قال‏:‏ مررت على رسول الله صلى الله عليه وسلم وفى إزاري استرخاء، فقال‏:‏ ‏"‏يا عبد الله، ارفع إزارك‏"‏ فرفعت ثم قال‏:‏ ‏"‏زد‏"‏، فزدت، فما زلت أتحراها بعد‏.‏ فقال بعض القوم‏:‏ إلى أين ‏؟‏ فقال‏:‏ إلى أنصاف الساقين‏"‏‏.‏.‏