For anyone wondering whether or not the two officially sanctioned instances of Marge being drawn with little to no clothes were coordinated, wonder no longer.  The Toronto Sun has this from Al Jean himself:

"It’s a little bit of a reference to our recent encounter with Playboy," Simpsons executive producer Al Jean said. "Marge goes to a photo shoot for a charity calendar and the photographer gets her a little tipsy, so she takes off a little more than she expects to.

"The episode idea came first, because we work a year ahead. The Playboy thing (Marge was the cover girl for the November issue) was an independent offer from Playboy. But we thought, to be smart, we should probably have them come out around the same time."

So there you go.  That’s the quote; now for the speculative question: What were the negotiations like between Playboy and Zombie Simpsons over what they could draw? 

The actual drawings are pretty tame, with only one of them having anything that qualifies as “nudity” (in that her nipples are drawn behind a sheer nightgown).  In terms of “what you can see” (the only measurement anyone cares about when it comes to nudity) there’s almost been more of Marge on the show.  I just wonder if Playboy wanted it to be less clothed and Zombie Simpsons came back with something like “you can show X but not Y or Z”.  (Though I suppose it could’ve been the other way around too.)  Are there previous drafts out there, where things are a little more or a little less revealing than the final versions?  Are there entirely different drawings that didn’t make the cut? 

C’mon people at Playboy and Zombie Simpsons, leak that stuff on-line.  It’ll be extra publicity (which I know you both care about) and you can even act righteous and indignant about it in public, and what’s more fun than that?