In the 60s I had a Simplicity pattern which was something in between. Pretty straight with vertical darts as well as side bust darts, but not that tight. Were they just at the back? I've been trying to remember it recently but haven't seen anything quite like it. The facings for neck and armhole were all in one. I could rattle one off in the afternoon and wear it at night. The in fabric then was 'Bushbaby' - do you remember that?