Is it just me, or do the vintage models have perkier tits than present day models. Today their tits seem to lay flat whereas back then they stuck out farther.
Having been aware of pics from wayback for much of my life, I think I can safely say that BBWs back then sagged like BBWs today.
But, I'd conjecture that the women in a lot of the vintage shots were often more of the slender&stacked variety. People in the pinup industry, wouldn't you say that might have been influenced by many of the models coming from burlesque and stripping - e.g. dancer physiques? And I do think a lot of the models you'd see as perky were probably petite, too (check a lot of the shots above).
SO - slender and stacked, or petite - that makes dimensionally smaller boobs look proportionally larger. Dimensionally smaller means lighter - and lighter means less droop and sag.
Opinions?
-D'Artagnian