Women's body structures have changed
Anyone else notice how the structures in general of women's bodies have changed over the past 100 years? Look at a women in a swimsuit or dress in the 1930s and place it next to a woman in swimsuit or dress today, there are more difference than just the change in styles and clothes and swimsuits. Womens' bodies had a more soft roundness and not as much defined definition, put some 1920s or 1930s pictures right next to some 21st century pictures and you can see overall in general differences in the shoulders structures, curves, hips, legs, even facial structure. It's less soft looking, more muscle definition in their legs today, and shoulders a bit less soft and more defined. As you know their definitions today aren't ripped, they're just more defined than back then. And something softer looking about their faces back then too (some of that though may be differences in facial expressions since modern women carry more assertiveness). Who else has noticed this?
Also, I have seen YouTube videos of real flapper girls dancing in the 1920s and 1930s, and then I saw some modern videos of girls today at a flapper themed party dressed up and dancing 20s and 30s style to 20s and 30s style music, and I could tell the differences, not just in comparing the old and modern picture video qualities, but I could tell the differences just in the differences between the old and modern women's body structures and faces.
There's differences in men too. You ever seen a man considered muscular in old films or photos? They looked big and developed but didn't have the ripped definition muscular men got today.