Sixth Condition

842. In Namaz, as per precautionary measures, the dress of a man, even his small scalp cap, or the laces for fastening the pajamas, or trousers, should not be made of pure silk. However, for men it is Haraam to wear pure silk at any time.

843. If the entire lining of a dress or a part of it, which is more than four joined finger, is made of pure silk, wearing it is Haraam for a man, and offering prayers with it will make it void.