akhee/ukhtee first we must understand that anything the prophet instructed was a sunnah/mustahab at most and anything he was STRICT on is a wajib act.
^ In this Fatwa it is considered a sin and the sunnah is enforced of keeping the lower garment above the ankles
-Mufti Ibrahim Desai
^^This puts emphasis on the reasons behind why the garments should not be lowered beneath the ankles,
read the chapter:
Chapter of "What hangs below the two ankles is in the Fire."
So it is clear that we SHOULD keep the garment above the ankles.
May Allah grant us the understanding
Im sry if could not help