The Collaborative International Dictionary of English v.0.48:

Mascled \Mas"cled\ (-k'ld), a.
   Composed of, or covered with, lozenge-shaped scales; having
   lozenge-shaped divisions.
   [1913 Webster]

   Mascled armor, armor composed of small lozenge-shaped
      scales of metal fastened on a foundation of leather or
      quilted cloth.
      [1913 Webster] Mascot