Ladies, what were the 1950s button down blouses that you tied at the midriff?

They buttoned down to just about your waist line, then you tied the two bottom pieces at the very bottom to give the crop look. Ladies wore them with shorts and also with peddle pushers. I know you can tie any button down shirt, or even a t shirt, but the ones I'm thinking of from years past, I cannot remember if they had a specific name. Any idea? I think Annette Funicello and Sandra Dee wore these in their movies.