KAR-256 - Hidden camera in gym staff locker room, catching female instructors changing

It's better to view this as a collection of candid-style nude shots taken with a fixed camera. Since the setting is a swimming instructor, there aren't many actresses with overly heavy makeup, and there are many with slim figures. The costume progression—training wear to full nudity to competitive swimwear—is personally my cup of tea, so I'll give it a generous 4 stars.