Some people who wear trousers, when they prostrate, their trousers ride up and expose their buttocks and part of their back. Is their prayer valid?

Question:
Honorable Shaykh, may Allah grant you success. He says: Some people who wear trousers, when they prostrate, their trousers ride up and expose their buttocks and part of their back. Should we order them to repeat the prayer?

Answer:
No, if he did not know. If he did not know, what do you command with this? They did not intend this, but inform them. Let him, for example, improve his garment, or his trousers, or his pants, so that it covers the navel and what is below it. Pay attention to this. Yes. As for invalidating his prayer, no. Yes.