Everybody's blaming Twiggy, but I remember Twiggy (I'm really dating myself here,) and she was never anything more than a brief fad. Most people I knew, male and female, did not find Twiggy attractive at all. I was naturally underweight at the time, so I was glad to see Twiggy come along because at last there was a model who was thin and flat-chested. (Prior to that, the ideal look was more va-va-va-voom voluptuous.) It was a small comfort, though, because like I said, Twiggy didn't last long and few people really thought she looked good or tried to emulate her.
I think Twiggy was a great model with a unique "look". Her face and especially her eyes made her memorable. Teri Reno and other top models before her were on the larger side of B-cup or C but there were not many that really fit the term "voluptuous". Lots of fashion models (as opposed to photographer's models) were flatter than Twiggy before Twiggy.