It is narrated from Imam al-Zuhri (may Allah have mercy on him) that the Messenger of Allah (peace and blessings be upon him) "declared the flesh of a carcass forbidden, but saw no harm in (using) its skin, hair and wool."
Shaykh Ali bin Umar (may Allah have mercy on him) said that the narrator Abd al-Jabbar is da'if (weak).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 82