The Collaborative International Dictionary of English v.0.48:

Vigonia \Vi*go"ni*a\, a. [Cf. F. vigogne vicu[~n]a. See
   Vicu[~n]a.]
   Of or pertaining to the vicu[~n]a; characterizing the
   vicu[~n]a; -- said of the wool of that animal, used in
   felting hats, and for other purposes. --Prescott.
   [1913 Webster]