Is it permissible for a muslim to give a clothing to a disbeliever which is not permissible for muslims to wear?
Yes It is permissible for a muslim to give clothing to some of his relatives who are disbelievers not for wearing it but for benefiting from it. He may sell it or it may be that this clothing is for women so he may give it to his women, daughters or wives.
Umar, in Makkah, gave his brother who was disbeliever silk garment which the Messenger of Allah ﷺ gifted him.(1)
So there is no issue in giving the garment as a gift to the disbeliever considering that it is not being given that he wears it. Only his wives may benefit from it or it may be that he sells it in case if this clothing is such a clothing whose buying and selling is permissible and also if it is from the garments of the opposite sex. He may have wives or daughters who may need it.
Shaykh Abu Bilal Al Hadhrami hafidhahullah
Abu Muhammad Nezam Al-Hindi
(1) The Hadith:
It was narrated from ‘Umar bin Al-Khattab that:`Umar bin Al-Khattab saw a silken dress (cloak) being sold at the gate of the Mosque and said, “O Allah’s Messenger (ﷺ)! Would that you buy it and wear it on Fridays and when the delegates come to you!” Allah’s Messenger (ﷺ) said, “This is worn by the one who will have no share in the Hereafter.” Later on some silk dresses were brought and Allah’s Messenger (ﷺ) sent one of them to `Umar. `Umar said, “How do you give me this to wear while you said what you said about the dress of ‘Utarid?” Allah’s Messenger (ﷺ) said, “I have not given it to you to wear.” So, `Umar gave it to a pagan brother of his in Mecca. (Bukhari 2612)
In the wording of Nasai 5295: “I did not give it to you to wear it! Rather I gave it to you to give away or to sell.”