* William Travilla: Travilla was arguably Monroe's most frequent collaborator, designing many of her most iconic looks, including the white dress from "The Seven Year Itch" and the "Happy Birthday, Mr. President" dress.
* Edith Head: A legendary costume designer, Head worked with Monroe on several films, including "Gentlemen Prefer Blondes" and "How to Marry a Millionaire."
* Jean Louis: He designed Monroe's dress for the "Happy Birthday, Mr. President" performance, which is considered one of her most famous looks.
As for her dress size, Marilyn Monroe was a size 14 (US) or a UK size 16. It's important to note that sizing has changed drastically over the years, and these sizes were considered average for her time.