It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that whatever the Prophet (peace and blessings be upon him) said regarding the "izar" (lower garment), the same ruling applies to the "qamees" (shirt/trousers) as well.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 5891