From what fiery pit of hell did the "Lava Diva" brand emerge?

You would think that Walmart, of all American brands, would have an intuitive sense of how to sell things to the more ample-bodied among us without offending them. You would be wrong. Walmart's Halloween costumes section featured (until this afternoon) a section labeled "Fat Girl Costumes," including witches, French maids, clowns, and some sort of vague forest maiden. All of these actually cover most of the wearer's body, which would be a positive thing if non-slutty women's costumes weren't reserved solely for women whom Walmart apparently doesn't want to see dressed skimpily. Twitter user Kristyn Washburn seems to have been the first to notice this about a week ago:

Sources: Jezebel | Mashable