It wouldn’t be accurate to call Attack of the 60 Foot Centerfold a good movie, but it was one that catered to growth fetishists. In this scene the main character, played by J. J. North, experiences the initial effects of a beauty-enhancing formula that will eventually transform her into a 60 foot giantess. For the moment, though, it just makes her breasts grow to enormous size.
Have you noticed it’s almost always the breasts that grow first? You can fast forward to the scene here.