السَّلَامُ عَلَيْكُمْ وَرَحْمَةُ ٱللَّهِ وَبَرَكَاتُهُ Jazak Allāhu khayran, if the garment like trousers or thobe etc are below the ankles for Salah, whether it was before or it fell during the Salah, does it invalidate the Salah since it’s a sin?

Ustadh AbdulAziz al-Haqqan

No, it doesn't.