"Torpedo tits" were mostly the result of the bras women used to wear and sometimes enhanced with the help of foam rubber falsies. In those days many women also wore girdles to slim their hips, tummies and butts. Merry Widows and corsets were also quite popular in those days for that hourglass figure.
also think it has a lot to do with estrogen levels. Women back then wanted to nurture their husband, have kids, raise a family, cook and clean. Now these bitches are all into crossfit, independance and other shit. Seems their estrogen is ramping down not giving them that famous gyno torpedo tits.