It is narrated from Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) that he said: "Whatever the Messenger of Allah (peace and blessings be upon him) said about the lower garment, the same ruling applies to the shirt as well."
Hadith Referenceالمعجم الأوسط / باب الألف / 423
Hadith Takhrij«أخرجه أبو داود فى «سننه» برقم: 4095، والبيهقي فى «السنن الكبرى» برقم: 3370، وأحمد فى «مسنده» برقم: 5997، 6329»