She was Marcy in Married With Children, and this is the closest she ever came to nudity.

Great collage by Penman

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My thought: the obviously real cleavage showing when she appears in her bra doesn’t seem to represent the same breasts beneath the diaphanous gown. My guess is that she was wearing a prosthetic chest in the see-through scene, but I don’t know that for a fact.

Prosthetics confirmed in the comments. Also find there some leads to a possible Bearse topless scene.