[Abraham]

As Salamu alaikum.

Many scholars say that wearing the trousers over your ankle is 'Farz' and to let it go down below that is 'Haram.'

I see lots of muslim around me and not many of them follow this. Plus, definitely Islam is beautiful and it would not task us something awkward. It sure looks odd when you tug up your black trouser over your ankle with those long oxford shoes on your feet (our college uniform is black pant, black shoe).

But this hadith does concern me-

(Bukhari shareef)
Volume 7, Book 72, Number 678:
Narrated Abu Huraira:
The Prophet said, "The part of an Izar which hangs below the ankles is in the Fire."

But I could not find an exact hadith in Muslim shareef. However, hadith about draggin your clothes is available there.

Book 024, Number 5191:
Ibn 'Umar reported Allah's Messenger (may peace be upon him) having said: Allah will not look upon him who trails his garment out of pride.

Again, in bukhari shareef, there's a hadith-

Volume 7, Book 72, Number 675:
Narrated 'Abdullah bin 'Umar:

The Prophet said Allah will not look, on the Day of Resurrection at the person who drags his garment (behind him) out of conceit. On that Abu Bakr said, "O Allah's Apostle! One side of my Izar hangs low if I do not take care of it." The Prophet said, 'You are not one of those who do that out of conceit."

If it is a 'Haram' how can the Prophet permit it?

Moreover, social norms have changed massively in the past thousand years. Is it haram if we don't mean arrogance or conceit?

I need to be certain. Any brilliant scholar to help me out?