Riyad as-Salihin (The Meadows of the Righteous)
by Imam Nawawi
121. Chapter On the Recommendation to take a middle course in clothes and not to confine oneself to what is miserable without need or legitimate aim
803. 'Amr ibn Shu'ayb reported from his grandfather: "The Messenger of Allah, may Allah bless him and grant him peace, said, 'Allah loves the token of His blessing to be seen on His slaves.'" [at-Tirmidhi]
