"The exhibition looks at the unofficial rules of royal dressing in a way many of the considerations that a designer or a royal individual will take into consideration when getting dressed in the morning," senior curator Deirdre Murphy told ABC News.
Mounted on the walls of the exhibition rooms are sketches with fabric samples pinned to each sketch alongside notes recording conversations between the designer and the women.
There are eighteen couture gowns on display in five rooms including some of Diana's most iconic dresses. One of them is a bottle green double-breasted velvet dress with beautifully detailed diamante buttons created by British designer Catherine Walker. In 1997 Diana was photographed wearing it for the famous Vanity Fair photo shoot by Mario Testino.
"Catherine Walker was one of Diana Princess of Wales’ favorite designers and she really helped to develop that very sleek elegant streamlined sophisticated look for the Princess of Wales for the 1990s and late 1980s," Murphy told ABC News.
A sophisticated, one-shouldered navy blue dress with gold rope detailing that Diana wore to a private occasion is also on display. The dress style became her signature look and shows off Diana’s more sleek style.
"She did have a daring side the way she dressed but she also dressed within a long standing royal tradition," Murphy said.
A memorable dress worn by the princess is another Catherine Walker creation: a black velvet bodice and voluminous tartan ball gown skirt.
And there is the off-the-shoulder salmon pink evening frock with a long tunic style bodice the princess wore to the reopening of the Savoy theater in 1993.
Diana's rules for dressing throughout the 1980s and 90s included wide shoulders and shoulder pads, dresses with dropped waists and bold trimmings to a more streamlined, elegant look. Perhaps the best description of her style comes from Catherine Walker.
The exhibition continues until January 2017.