The Collaborative International Dictionary of English v.0.48:

Cyclas \Cy"clas\ (s?"kl?s), n. [Cf. Ciclatoun.]
   A long gown or surcoat (cut off in front), worn in the Middle
   Ages. It was sometimes embroidered or interwoven with gold.
   Also, a rich stuff from which the gown was made.
   [1913 Webster]