The actor said her look had ties to Ruth Handler, the creator of Barbie.
The actor discussed the doll's cinematic future after Greta Gerwig "put everything" into the movie.
Film producer Josey McNamara says he wants to see the pair do even more projects together.
The hit film nearly saw the "Wonder Woman" star as the pink-powered leading lady.
The actor told executives that the pink-loaded film would reach epic heights at the box office.
In just three weeks in theaters, Greta Gerwig's movie will sail past $1 billion in global ticket sales, becoming the biggest to be directed by one woman.
I walked into Barbie ready to party, and I walked out reflecting on my own existence.
Actors Margot Robbie and Ryan Gosling have seemed more enthusiastic about the prospect of reprising their roles in a future film.
“I knew I wanted to end on a joke,” the director said.
“They were, I’m not kidding, really bummed they couldn’t do it,” Allison Jones said of the actors, including a Broadway star and an "SNL" cast member.