I don't have names for my mogs, but I guess that will change in Legion. Anyway, here's one of my more commonly used sets for Lil. The robe, gloves and the hood is from the End Time instances. The belt is from the Throne of Thunder set for priests. Mismatched because that belt has a book on it (so her Lightmancer book is there as it should be yadda yadda). I do have half a mind to get the heroic version of the belt, since it would match better for white sets.
The shoulders are the Ulduar tier shoulders for priest. I use these instead of the End Time shoulders because the fuckers never dropped for me back in Cataclysm, and I haven't bothered to go back for them since. Besides, I think these shoulders match just fine.