
To get this joke it is really only necessary to know that people create visualizations of their World of Warcraft characters that are a lot more... fanciful than the graphics provided by the game.
Dramatis personae:
"Ellyanna" - a female priest played by a woman who likes to make risque' jokes on chat
"Snique" (aka Snique E Bastid) - me, in my snarky mode
Ellyanna posts her new avatar image, thus:

Dear Ellyanna
I think you have hitched your belt up a little bit too high in that picture and I worry that it may have affected your torso. Also, traditionally, a belt is used to hold in place a pair of pants or similar clothing item. Using it alone is certainly a daring fashion statement, particularly given the gravity-defying aspects of your physique, but I worry about what will happen when you take it off for your "Discipline."
Yours in fashion,
Snique