Near the end of Novitiate, we see a cross on the ground. Margaret Qualley then bends down to pick up the cross and we see her breasts briefly as the camera pans up. The camera stays on Margaret’s face for a while and then we get another quick peek at her breasts as she stands up. There may also be a brief full frontal peek as Margaret puts the cross down and walks away but that is likely some special effects of some sort. Margaret’s face and breasts aren’t ever really in the same frame since it is shot so close up but that is one single take so no worries about whether that is really her. Margaret also has three other changing scenes and the self-flagellation scene where she is partially topless but doesn’t really show anything.
Around 42 minutes in, Dianna Agron is sitting on a bed in her nun habit except for the headpiece when she starts masturbating. Dianna is fully clothed and starts crying at the end so not really a hot scene.
And around half way through the movie, we get two very brief and distant looks at Marshall Chapman full frontal nude as she starts ranting to all the other nuns.