The Collaborative International Dictionary of English v.0.48:

Haik \Haik\ (h[=a]k; Ar. h[aum]*[-e]k), n. [Ar. h[=a]["i]k, fr.
   h[=a]ka to weave.]
   A large piece of woolen or cotton cloth worn by Arabs as an
   outer garment. [Written also hyke.] --Heyse.
   [1913 Webster]

WordNet (r) 3.0 (2006):

haik
    n 1: an outer garment consisting of a large piece of white
         cloth; worn by men and women in northern Africa [syn:
         haik, haick]