In this scene we are entertained by a fashion show of designs by the great Hollywood designer Adrian. Note the use of color for this scene while the rest of the movie is shot in black and white. You may remember that in "The Wizard of Oz" that most of the movie was shot in color and only a couple of scenes in black and white.
It is also worth noting the crazy beach costumes and the dresses for going on a picnic. Completely crazy. My favorite is the French military inspired daytime suit. Fantastique!