Maliks Muwatta Book 5, Hadith Number 18.
Section : Good Appearance and Not Stepping Over People and Facing the Imam on the Day of Jumua.
Yahya related to me from Malik from Yahya ibn Said that he had heard that the Messenger of Allah, may Allah bless him and grant him peace, said, “There is nothing wrong in wearing two garments which are not work-clothes for jumua.”