The Collaborative International Dictionary of English v.0.48:

Tasset \Tas"set\, n. [See Tasse.]
   A defense for the front of the thigh, consisting of one or
   more iron plates hanging from the belt on the lower edge of
   the corselet.
   [1913 Webster]

WordNet (r) 3.0 (2006):

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