It was not all ladies dresses. The Coronation mantal of Edward VII was also on display. There were also paintings like the famous Tuxen painting of Queen Victoria and her family. The only clothing items on display were the Coronation ones.

You can take a virtual tour of the exhibition.

https://www.rct.uk/collection/exhibitions/the-edwardians-age-of-elegance/the-kings-gallery-palace-of-holyroodhouse/virtual-tour-of-the-edwardians-age-of-elegance