Holythane
Lewno
It's been a while since I've levelled a toon into Outland. I thought it was lvl 58. I guess it's every quest in the Old Kingdom, being Kalimdor and Eastern Kingdoms. Once you get to Outland, the quests no longer award transmog gear for lvl 20's.
Though I have seen some toons with a cool green axe from Outland - http://www.wowhead.com/item=31062/torn-heart-axe-of-battle. Must be using @Feribb tool or something. Reason I know is I used to have a DK with that axe and I can't believe I've seen a few 20's with it
People with it (like me) most likely did it when the original high level transmog thing worked in cata. I have not sent the heirloom from my pala since patch 4.3 so i still have it.