Worked as a PB Bunny in my mid thirties... Bunnies all wore uniforms and their bodies had to conform to the uniform so that we all looked... well, uniform.
If you had A or B-cups, you were required - required! - to use sweat socks (specifically!) to prop those babies up so they looked like C's. Heaven forbid that you were any size above a D, though, because then you had to smash the over-spill down into your corset (which was already set to take 10 inches off your waist).
My closest friend had been a bunny for all her working life - she was in her 20's - and, released from the confines of her uniform, her triple - or more - D's hung down like used condoms to her knees. It was beyond sad.