At a time when sizes 5, 7, and 9 were considered petit and there was no size 0.
This was before the ‘Twiggy’ Phenomenon...........
Exactly. Sizes then are nowhere near the sizes now.
Today's size 4, 6, 8, etc. has more fabric, meaning it accommodates a bigger body than before, allowing silly women who haven't figure out the scam to think they're still as they were when younger.