Regarding cleavage from the DS women...
I think the closest we got to that was during that lame costume party Barnabas held at the Old House with Vicki and Carolyn, and then at a couple of points during 1795.
Specifically, I'm thinking of Angelique's wedding dresses.
If you've ever seen pictures of the evening gowns that ladies in the 19th century wore, you'll know that the DS actresses were painfully modest.
The other way around, of course, we had KLS in her infamously short skirts as Mrs. Quentin Collins and the fabled panty scene that gets the members of TLATKLS fan club very happy