The Collaborative International Dictionary of English v.0.48:

Trousseau \Trous`seau"\ (tr[=oo]`s[=o]"), n. [F., fr. OF.
   trossel, dim. of trousse a bundle, truss. See Truss.]
   The collective lighter equipments or outfit of a bride,
   including clothes, jewelry, and the like; especially, that
   which is provided for her by her family.
   [1913 Webster]

WordNet (r) 3.0 (2006):

trousseau
    n 1: the personal outfit of a bride; clothes and accessories and
         linens