Pre-Raphaelite dress as pseudo-historic costume

"Gather Ye Rosebuds While Ye May"
by Waterhouse.  Wikiped

If the Pre-Raphaelite woman chose a historically-inspired style, there were two main time periods and cultures that were popular choices: classical Greece/Rome, and 15th century Medieval Europe.  The Pre-Raphaelite "standard" of female beauty was an amalgamation of the various Classical Greek and Roman goddesses and nymphs, especially the Venus de Milo.  Since their ideal of beauty wore draperies without corset, hoop, bustle or petticoats underneath, the Pre-Raphaelites reasoned, so should the modern woman!

"Sapphires" by Art Moore.
www.ArtMagick.com

Pre-Raphaelite dress as modified Reform Dress.

Morris and Burne-Jones families. ca. 1874.

Pre-Raphaelite dress generally took two forms: modified contemporary fashion, or historically-inspired styles.  If choosing modified contemporary fashion, gowns would be styled according to the dictates of Reform Dress or "Rational Costume," which advocated comfort and freedom of movement, fabric breathability, and natural fibers and colors in an effort to promote greater health.