Since we're on the subject of creature costumes and breasts, I figured I should point out the existence of a 1956 movie called "The She Creature," which featured a monster with large breasts.
Finding a clear picture of the suit with the breasts fully visible online is hard due to the numerous pictures of
the poster, pictures that only show the monster's head, or that are from a more recent movie with the same title. I did manage to find
these pictures and
a picture that might be of a toy or model kit version of the creature.
According to
this informative article about the work done by the suit's creator, Paul Blaisdell "...took great pride in the creations he made for these movies. He said of his She-Creature, "She could do anything...She could eat, she could sleep, she could drink...She could borrow a cigarette from you, inhale it and blow smoke out of her nose. And in spite of how clumsy her claws appear to be, she could pick a handkerchief out of your pocket. These were the things I built into her to make her more lifelike." Blaisdell worked hard to make his monsters detailed, flexible, and active."
The article also notes that the She Creature suit had "...sharp horns that protruded from the creature's belly and could be opened and closed using his stomach muscles. Blaisdell termed them "lunch hooks" and they were designed to ensnare and disembowel a foe. The director decided not to use them."
I don't know how anyone could seriously consider arguing that a monster suit maker couldn't think of "minor details" after reading that. It takes far more imagination to add working "lunch hooks" to a costume than it does to add breasts.
This site claims there was a stir over the costume's breasts when the movie came out (it also notes more about Blaisdell's work and his magazine that give creature suit-building tips), but that didn't stop the suit from getting modified and reused in 1957's
"Voodoo Woman" (albeit wearing clothing) and in 1959's "The Ghost of Dragstrip Hollow." I should note that picture is from
the official website of famed gorilla suit actor, Bob Burns. The supposed stir also didn't keep the movie from airing on television,
as shown by these vintage TV listings. It doesn't seem like giving a Bigfoot costume breasts would've negatively effected its ability to be shown in theaters or on TV to me.
I should also note that when the actor selected to play the title creature in "It! The Terror From Beyond Space" (1958) was too large for the costume Mr. Blaisdell created, he came up with an ingenius solution to the problem of the actor's chin sticking out of the mask's mouth: He painted it so it would look like the monster's tongue! You can read more about it
here.