Student uniforms in Thailand are a frequent question of foreign applicants. They have a long tradition and can be found at any Thai educational institution. Therefore, the different ways to carry the uniform also show the different social states of the institutions.
Very few international programs leave it up to the students to wear uniform or not. Most freedom is probably given in Bangkok due to international influences. Outside Bangkok, student uniform is rule. If this appears strange to you, look for a program with a quite high percentage of foreigners, but never forget to ask before you register.