People who wear jeans in salah in such a way that their lower back becomes exposed in sajda what is the ruling regarding their salah and how should one approach them.
If a quarter of the limb is exposed, then salah is invalid. If less then it’s Makrooh. Either way you should approach the person if it’s appropriate, preferably in private, and explain in a polite manner that this decreases the reward in salah and is distracting for others.
Therefore we should wear Sunnah clothing or at least make sure the back is properly covered.