I have been a university professor here for 14 years and unlike others who have commented so far, I don't need to speculate on what students think, why they have to wear uniforms and why talking about western universities is irrelant.
Generally, Thai university students like their uniforms as they identify the student immediately according to the badge they wear, and distinguish them from students from other schools and are thus a source of pride and friendly rivalry. For example, if you're a student at schools like Chula or Thammasat, both of which I have taught at, you are immediately identified as the best among the country's students. Chula as the #1 elite university in the country has a distinctive uniform that separates it from all other university uniforms in the country.
Since the concept of the group dynamic is all important, uniforms simply serve the purpose of reinforcing this. Notions of western individualism are simply a foreign concept here and wouldn't really work well on Thai university campuses.
The only negative I see with the uniforms is when university administrators get hysterical about uniform infractions. More often then not, this has to do with hierarchical power games by these administrators particularly against female students. These reactionary administrators usually lose sight of, or simply have no interest in the the true purpose of why the students are actually at the university, in the first place.