What is "mistress of the robes"

Robe \Robe\, n. [F., fr. LL. rauba a gown, dress, garment; originally, booty, plunder. See Rob, v. t., and cf. Rubbish.]

1. An outer garment; a dress of a rich, flowing, and elegant style or make; hence, a dress of state, rank, office, or the like.

   Through tattered clothes small vices do appear; Robes and furred gowns hide all.
   --Shak.

2. A skin of an animal, especially, a skin of the bison, dressed with the fur on, and used as a wrap. [U.S.]

   Master of the robes, an officer of the English royal household (when the sovereign is a king) whose duty is supposed to consist in caring for the royal robes.

   Mistress of the robes, a lady who enjoys the highest rank of the ladies in the service of the English sovereign (when a queen), and is supposed to have the care her robes.

The Mistress of the Robes (; ; ) is the senior lady in the royal households of Denmark, Norway, Sweden and the United Kingdom.