Uniforms are compulsory for all students with very few variations from the standard model throughout the public and private school systems, including colleges and universities.
The dress code in elementary and secondary grades for boys is knee-length dark blue, khaki, or black shorts with a white open collar short-sleeved shirt, long socks, and brown or black trainers. Girls wear a knee-length dark blue or black skirt and a white blouse with a loosely hanging bow tie. The bow tie is dropped in favor of an open-necked light blue shirt from Matthayom 4. The girls' uniform is complemented by white ankle socks and black school shoes.
The student's name, number, and name of the school are often embroidered on the blouse or shirt. Some independent or international schools have uniforms more closely resembling British school uniform standards, and boys in senior high school grades may be allowed to wear long trousers.
The standard dress for children in kindergarten is a red skirt and white blouse for girls and red shorts and a white shirt for boys. In all Thai schools, one day per week, usually Thursday, is dedicated to scouting, when beige scout uniforms for boys and dark green guide uniforms are the rule, both wearing yellow neckerchiefs. Many schools have some color variations of the scout uniform such as blue uniforms with blue neckerchiefs for girl scouts at Wattana Wittaya Academy. The use of accessories is prohibited for males, while females are sometimes allowed to use simple accessories. All students are prohibited from coloring their hair or having tattoos.
University uniforms are standard throughout the country and consist of a white blouse and plain or pleated skirt for females, and long black trousers, a white long-sleeved shirt with a dark blue or black tie for males.