The Collaborative International Dictionary of English v.0.48:

Bloncket \Blonc"ket\, Blonket \Blon"ket\, a. [OF. blanquet
   whitish, dim. of blanc white. Cf. Blanket.]
   Gray; bluish gray. [Obs.]
   [1913 Webster]

         Our bloncket liveries been all too sad.  --Spenser.
   [1913 Webster] Blond