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That she was, and her "breasts as a priority" attitude can be appreciated to this day.
Makes one wonder if there, at that time, had been a usable healthy method to make busts larger, would Jayne and other actresses and models gone for it. And how big. Would the pointy torpedo shape have been a preference...
Here is actress Jayne Mansfield pictured once again visiting breast enhancement clinic in West Hollywood. We have been pleased to report her progress as she has grown prettier and prettier, but this time she certainly has inched out a new milestone in beauty. It is expected that Jayne's latest development will prompt Marilyn Monroe to revisit the good doctor, as the women compete who is the biggest star of the silver screen. It may, however, not be a two-way battle, as there are many more ladies who are preparing themselves to steal the title.
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That would have been wild for the 1950's if giant breasts implants like nowadays were available then.

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There were implants that were done in the 1950s. Sponge was the prefered IIRC and it was not good including infections BAD ones. in the 60s they were using direct silicone injection and silicone OIL leading to all kinds of bad side effects. the FIRST recipient of breast implants had them done in the 1962s Timmie Jean Lindsey had hers into the 80s.
https://en.wikipedia.org/wiki/Timmie_Jean_Lindsey