The Collaborative International Dictionary of English v.0.48:

Individualistic \In`di*vid`u*al*is"tic\, a.
   1. Of or pertaining to the individual or individualism.
      --London Athen[ae]um.
      [1913 Webster]

   2. exhibiting marked individuality[3] in thought and action;
      as, an individualistic way of dressing.

   Syn: individualist.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

individualistic
    adj 1: marked by or expressing individuality; "an
           individualistic way of dressing" [syn: individualist,
           individualistic]
    2: with minimally restricted freedom in commerce [syn:
       individualistic, laissez-faire(a)]

Moby Thesaurus II by Grady Ward, 1.0:

92 Moby Thesaurus words for "individualistic":
   absolute, acquisitive, ambitious for self, autarchic, autarkic,
   autistic, autonomous, bourgeois, capitalist, careerist, certain,
   concrete, defined, definite, detailed, determinate, different,
   distinct, distinguished, egotistical, esoteric, especial,
   exceptional, express, extraordinary, fixed, free-enterprise,
   free-spirited, freewheeling, grasping, greedy, heretical,
   heterodox, independent, individual, individualist, inner,
   inner-directed, intimate, minute, narcissistic, neutral,
   nonaligned, nonconformist, nonpartisan, nonsocialistic, noteworthy,
   particular, personal, personalistic, possessive, precise, private,
   private-enterprise, privatistic, remote, respective, self-absorbed,
   self-admiring, self-advancing, self-besot, self-centered,
   self-considerative, self-contained, self-dependent,
   self-determined, self-devoted, self-directing, self-esteeming,
   self-governed, self-governing, self-indulgent, self-interested,
   self-jealous, self-occupied, self-pleasing, self-reliant,
   self-seeking, self-serving, self-subsistent, self-sufficient,
   self-supporting, selfish, several, singular, solipsistic,
   sovereign, special, specific, third-force, third-world,
   unorthodox