Years ago, I posted [1] two highlights of see-through erotica.

Both were film stills. The first[3] was from Succubus (1968) directed Jess Franco, the second[4] was from Castle of Blood (1964), directed Antonio Margheriti.

Today, the full movies of these stills are available on YouTube:

From Castle of Blood I was able to find the exact location of the film still in question[4]. The woman who is wearing the translucent crinoline and who bares her perky breasts appears to be Sylvia Sorrente (Elsi in the film).

From Succubus I was unable to track the still. However, I was able to get a wider shot[6]. La Reynaud appears to be stripping for a pianist seen from the rear in the back.

Castle of Blood is a good film, with an eerie soundtrack by Riz Ortolani. It is World Cinema Classic #189.