My guess is that this may be in the nature of a Trial Balloon just to see what
they can get away with. I think I have seen this once before, on an episode
of Becker which CBS ran early in the decade. For much of the episode Shawnee
Smith's character is essentially topless. I remember thinking that was very strange for a broadcast prime-time show. This was not too long before the Janet
Jackson Super Bowl fiasco, which leads me to believe that they were testing out potential reaction beforehand. If that was their strategy it certainly did not work as planned.
Does NBC have the Super Bowl next year? If so perhaps they are looking at Eminem for the halftime show?
Ironically, whenever that episode of Becker runs now on cable there is a huge black bar placed over Shawnee Smith's chest.