Why were boobs so pointy in the 50s

My mom’s passport foto dress and wedding dress have no boobs. Just sort of a boob “area”, a single, pyramidal rectangle, in the appropriate area. Always reminded me of the costumes from “The Lost Saucer”, if you want to take it to a ridiculous extreme. I always tell people who see the foto – my mother does have two breasts. That’s just a '50’s style.