What is the ruling on long garments (like trousers)? Thank you.

The general rule regarding men's clothing is two-fold: it is recommended to limit it to mid-calf, and it is permissible to wear it down to the ankles. What is below the ankles is in the Hellfire. Scholars have agreed on the prohibition of dragging garments out of arrogance. They have differed concerning one who drags his garment without arrogance, and the preponderant view is that it is prohibited.