As Mental Floss reports, a receptionist took Marilyn’s measurements in 1945, when the future actress — then going by Norma Jeane Dougherty, her first married name — signed up with modeling agency Blue Book Agency. According to that receptionist’s notes, the then-19-year-old stood at 5-foot-5, weighed 118 pounds, had measurements of 36-24-34, and wore a size 12.
Blue Book owner Emmeline Snively once recalled her impression of Marilyn. “She was a clean-cut, American, wholesome girl — too plump, but beautiful in a way,” Emmeline said, according to Donald Spoto’s biography of the actress.
Source: https://www.distractify.com/p/what-size-was-marilyn-monroe