Abu Bakr Al-Marroozi (rahimahullah) mentions the following:

On one occasion, a new khuff (leather sock) was made for Imaam Ahmed bin Hambal (rahimahullah). I thus brought the new khuff and delivered it to him, and it remained with him for the night. The following morning, Imaam Ahmed (rahimahullah) said to me, “I have been thinking about this khuff the entire night. It has distracted my heart (from my ‘ibaadah). Hence, I have decided that I will not wear it.”