Messenger of Allah, I have only one clothe and I menstruate in it, how should I do ? He said: When you are purified, wash it and pray in it. She asked: If the blood is not removed, (then what) ? He said: It is enough for you to wash the blood, its mark will not do any harm to you.
Sunan Abi Dawud Book 1, Hadith 365
← Previous Hadith One of us would have a shirt in which she would menstruate and in it she became sexually defiled. Then if she ever saw any drop of blood in it, she would rub it off by applying her saliva.

Sunan Abi Dawud Book 1, Hadith 364 Next Hadith → Mu'awiyah ibn AbuSufyan asked his sister Umm Habibah, the wife of the Prophet (ﷺ): Would the apostle of Allah (ﷺ) pray in the clothe in which he had an intercourse? She said: Yes, when he would not see any impurity in it.

Sunan Abi Dawud Book 1, Hadith 366