The shadow was just a one time effect to convey a mood of 'deep thought.' Or what Rita thinks is deep thought. It's stylized, because if it were realistic, then the chair would be throwing a shadow across her back, like the arm does over her skirt. We cheat these things sometimes. But I ain't gonna do it often, 'cause it doesn't fit the day to day mood of the strip. Perhaps I'll start drawing it like Prince Valiant. No, you say?
I think Scott misses my point -- a bathrobe is WAY sexier than office wear -- when it falls open, well....anyway, Scott needs to lighten up some -- insecure cartoonists try too hard not to offend -- go ahead, Scott, offend us with some really racy art and dialogue -- persuade John to get this woman LAID!
I'll have to get John to write a gag where she's in a bathrobe, and then you'll see the difference.
I think maybe you're used to idealized sexy drawings where women's clothes fit like a coat of paint. And if not, then I can't help what you're expecting to see. In the pose she's in, the jacket comes forward and bunches up, it's that simple. Take my word for it, it's the same outfit she normally has on. Would you insist that a zebra is a horse in striped pajamas, even if told different?