There was a time when porn was a rarity (Yes!) and the most that censorship and conventions allowed was partial nudity. I have bumped on this 1966 flick - "Naked Fury", that belongs to this category. It has some curiosities: it is starred by the Bennett twins - Darlene and Dawn, and the plot has a photographer shooting a staged catfight. The sisters had a long career in the partial nakedness sub-genre, mostly portrayed in nudist resort and beaches. The short movie also finishes by a "real" staged catfight.
There is a first here: I put the whole movie below just because it has only ten minutes and the copy quality is not that good.