Maliks Muwatta Book 48, Hadith Number 19.
Section : Ways of Dressing.
Yahya related to me from Malik that Ishaq ibn Abdullah ibn Abi Talha said, “Anas ibn Malik said, ‘I saw Umar ibn al-Khattab when he was the amir of Madina. Three patches were sewn between his shoulders, one patched over the other.'”