The Collaborative International Dictionary of English v.0.48:

Tasse \Tasse\, n. [OF. tassette.]
   A piece of armor for the thighs, forming an appendage to the
   ancient corselet.
   [1913 Webster]

   Note: Usually the tasse was a plate of iron swinging from the
         cuirass, but the skirts of sliding splints were also
         called by this name.
         [1913 Webster]

WordNet (r) 3.0 (2006):

tasse
    n 1: one of two pieces of armor plate hanging from the fauld to
         protect the upper thighs [syn: tasset, tasse]