Originally Posted by
Frinata
If it's simmilar to the Hunter set for the Return to Lordaeron questline, then you'll need to complete it on a Paladin, yes.
It's a bit unfortunate that it does it like this, as I was in a simmilar situation to you for the RtL questline mentioned above, but I don't have access to the wardrobe on my Hunter, so now I need to do it again on said Hunter.
Hopefully this isn't a dealbreaker for you, leveling up isn't too hard, just remember to wear a Silvermoon rep tabard, get to exalted with them while you level up (dungeon grind and target Silvermoon quests), and you'll be good