Question Summary:
Keeping trousers above ankles

Question Detail:

Salam, I was wondering if it is manditory to keep your pants aabove your ankles at ALL times
Jazak,Allah

Answer :

In the Name of Allah, the Most Gracious, the Most Merciful.
As-salāmu ‘alaykum wa-rahmatullāhi wa-barakātuh.
In principle, it is necessary for males to wear their garments above their ankles at all times. [1]
And Allah Ta’āla Knows Best
Abdul Azīm bin Abdur Rahman,
Student Darul Iftaa
U.S.A.
Checked and Concurred by,
Moulana Ismail Desai. 
daruliftaa.net