Couleur (from French, meaning colour in English) is the expression used in Central European Studentenverbindungen for the various headgear and distinctive ribbons worn by members of these student societies.
There are three classes of such student societies:
Societies with no colours (so called schwarz, in English black)
Societies with colours but wearing no ribbon, no cap etc. They wear their colours e.g. in their coat of arms or as Zipfel.
Societies with colours and wearing a ribbon, a cap etc.
Ribbon
The ribbon (so called Band) is worn over the right shoulder to the left hip. Both ends are held together by a button, often fashioned from metal or porcelain. These buttons are often engraved or enameled with a Zirkel and at times even specific coat of arms associated with the student society in question. A lot of societies distinguish two types of ribbons. One is used by the new members (so called Fux or Fuchs, after the German "fox", or schacht in Flanders, a word borrowed from the military, where it meant "new recruit"), the other one is used by the elder members (so called Bursche or, if with degree, Alter Herr; in Flanders elders members are ouderejaars). The ribbons of the elder members show the original or full colours of the society, where the ribbons of the new members often show a variation of them, such as displaying only two of the three main colours. In the Flemish tradition new members wear the full colours, but on the left shoulder, instead of the right.[2]
Headgear
Cap
Mostly a cap (so called Mütze) consists of:
a black bill,
a crown coloured by one of the colours of the ribbon,
A special and seldom seen form of headgear is the Stürmer (English hotspur).
It has a black bill, a black band and the top of the crown points to the front. The crown is also coloured by one of the colours of the ribbon. Sometimes a Zirkel is embroidered on the top. Traditionally, the Stürmer is only worn in the summer semester of the academic year.
Tönnchen
A Tönnchen (diminutive of Tonne, English barrel) is a headgear with:
a flat crown, the top coloured by one of the colours of the ribbon and mostly embroidered with the Zirkel,
straight upright sides with the colours of the ribbon,
Tönnchen are worn instead of caps by the elder members while in official occasions.
Straßencerevis
A Straßencerevis looks like a Tönnchen but is embroidered with a Zirkel and oak leaves or vine leaves.