810/1 - Anas (may Allah be pleased with him) reported: “The Prophet (may Allah’s peace and blessings be upon him) gave a dispensation to Al-Zubayr and ‘Abdur-Rahmān ibn ‘Awf to wear silk because they had itchy skin.” [Narrated by Al-Bukhāri and Muslim]
1) Silk is smooth, soft, and cool which helps to alleviate the itch. Hence, the Prophet (may Allah’s peace and blessings be upon him) permitted wearing it for necessity.
2) This shows how the religion is easy and tolerant and how it takes people’s conditions into consideration. How blissful the believers are by their adherence to the Shariah of the Almighty Lord!
It is permissible for men to wear silk in four cases:
First: For some need, like having itchy skin.
Second: If it is equal in size to four fingers or less.
Third: If silk is mixed with another prevailing material.
Four: At war, for the purpose of irritating the disbelievers.