It is reported that a shaykh (older man) once came and greeted ‘Alī – Allāh be pleased with him, wearing a cloak decorated with silk at the front. He said to the man, What is this filth under your beard? The man looked around and said, I do not see anything. Another man said, He means the silk embroidery. The shaykh said, In that case, we will throw it away and never wear [such a thing] again.

Ibn Abī Shaybah, Al-Muṣannaf article 25187