When I first saw the episode during which Quentin finds the voodoo doll while Maggie was changing, I was positive  that Maggie was topless (her back, of course to the camera).  Then, decades later when I saw it again, there she was, wearing a slip.  But that couldn't be - I was just so positive she was au natural.  Well, I shrugged it off as just another case of Faulty Dark Shadows Memory Syndrome (FDSMS), most likely caused by the hormones of a 13-year-old boy who was madly in love with TLATKLS.  So I watch it again today, but this time I decided to do an experiment (I was watching the taped episodes).
I had mentioned in another thread that I grew up watching DS totally in black and white - we didn't get a color TV set until '76.  Rewinding the tape, I then toned the color all the down to b&w.  Replaying the scene, the color of Maggie's slip blended into a flesh tone and she looked like she was momentarily sans top.  It was not a faulty memory; it was not the result of a pubescent boy hopelessly in love.  It was the result of an old Admiral black-and-white television set.
Today, I feel vindicated.
Gerard