The climate is the main factor that make the people in the different area dress up in different style. In the area with very low temperature, they always wear the clothes that cover all of their body. In the high temperature area, people will wear the clothes that made from cotton which can prevent the heat from sunlight such as Karen.
In each period of thailand, some of dress up
style receive from the other nation.
For example, Hawaiian, they wear grass
as a skirt for project the insect.
Therefore, the way that thai people dress up
are all different is each period which
are Sriwichai, Lopburee, Chiang san and
Reference (Thai) : http://www.baanjomyut.com/library_2/history_of_costume/01.html