I dont think you can get it.
on the adventure quest worlds wiki
There is a cape that gives the quest for the set...
Go to the shop
corner486
Adak in northlands
citadel
thirteen1
do his quests
KIll a crusader in the citadel
its like the rustbucket armor but its for members
SUGESTION SHOP, (yulgar)
The armor is dropped by Wolfwing.