Prayer: Is Prayer Invalid If One Doubts the Purity of Their Clothes?

Practical Laws of Islam as per the teachings of Imam Khamenei

Prayer: Is Prayer Invalid If One Doubts the Purity of Their Clothes?

English:

Question #426:

Will my prayer be invalid if I perform them in clothes that I doubt are najis?

Answer #426:

Clothing which one doubts its being najis is considered pure and it is correct to perform prayer in it provided that we are not sure that it was najis before the time of doubt.

-Imam Khamenei, Practical Laws of Islam, Importance and Conditions of Prayer