I don't believe dragons dropped magical clothing, yet alone any magic items short of the regular set (vanq etc). I don't remember ever getting any mage's bane, or invisibility items from these lower level monsters. Only the high end monsters (ancient lich, balron, ancient wyrm) were able to drop such loot (espeically teleport rings...) hence the rarity that they had on the OSI servers.
The only reason I bring this up is in a few weeks people will be fighting with entire bless suits..