From 1981, here is a fun McCall's Pattern # 7573 Woman's Jumpsuit Size SMALL that is either long or short jumpsuit, pleated into front and back yokes, has shoulder straps buttoned to front; waistline casing and elastic are optional.
Since this pattern is a size SMALL from YEARS ago, a size small was a size 10/12....
Size 10 Bust size is 32 1/2 Waist 25 Hip 34 1/2
Size 12 Bust size is 24 Waist 26 1/2 Hip 36
The pattern and instruction sheet is still factory folded but the envelope shows wear from storage and age.