From May 31 until August 21, 2011, the Getty Center in Los Angels will play host to the exhibit Fashion in the Middle Ages.
From the Getty website:
The figures that inhabited the illuminated pages of medieval manuscripts could be recognized at a glance by the clothing they wore. Artists used costumes to identify people by profession or to place them in a social hierarchy. Yet, as this exhibition demonstrates, illuminations did not provide accurate depictions of dress. Wealthy patrons commissioned images of a perfect world, filled with glamorous versions of themselves and rather too-well-dressed peasants, while biblical figures were given a "historical" wardrobe that mixed ancient and contemporary elements.