I have now been in my new semester for two weeks, I been going to school 2 years (?), and I have only just now learned that only specific designers are considered "Couture". You have to be an official member of the Chambre Syndicale De La Haute Couture, to truly be considered couture. It is funny how this word Couture is obviously thrown around, when you really need to be inducted by this council that is hundreds of years old and has strick guidlines.
If you are interested about hearing more, click either of the links below, it is very interesting.
As of 2011, This is the list of all of the Couture designers.
Members of theChambre Syndicale De La Haute Couture:
More info, Here