It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: "The lower garment of the believer should reach to the middle of his shins, and there is no harm if it is between that and the ankles; and whoever drags his garment out of arrogance, Allah will not look at him (with mercy)."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 13235