Rulings of Prayer
Dress code: Part Six
Just as the clothes of the person praying must not be made out of the living parts of an animal whose meat is Halal, it must not be made with the living or dead parts of animals whose meat is not Halal to eat either. So, if the person praying carries even one strain of hair from an animal whose meat in not Halal such as the tiger, lion, or cat on their prayer is void.
In the case a person is in doubt whether their clothes are made with the wool or hair of an animal whose meat is Halal or not, they can perform their prayer in those clothes, Whether those clothes are purchased from an Islamic country or a non-Islamic one.
The next condition is specific to men. The clothes of men while praying should not be made with pure silk. Wearing clothes made with pure silk is generally prohibited for men and wearing such clothing for prayer will also invalidate the prayer.
Even if the amount of pure silk in men's clothes is as small as a shoe lace or a patch it will nullify the prayer altogether.
It should be noted that it is permissible for both men and women to wear clothes that are made with fabric which is a mixture of silk and some other material. But if the amount of silk is so little that is can be disregarded, it is not permissible for men to perform their prayer in such clothing.
Women on the other hand, are allowed to wear clothes made with pure silk both in prayer and otherwise.