You'll be able to hide your pants as a new transmog option in The War Within!
Back in 2019, Blizzard announced that they would allow players to hide all armor slots for transmog...besides pants. Now five years later, this final armor slot joins the party.
As character customization becomes more and more elaborate, with races like Earthen having gems on their legs or Dracthyr Visage form having full body scales, the ability to hide leg armor will allow these races to show off their unique models.