This article aims to study the evolution of Thai national costumes on the stage of Miss Universe contest since 1969, which is the first year that Thailand has won the best national costume award on the Miss Universe stage until 2017. And studying factors affecting the change of Thai national costume styles by using research methods from newspapers, photographs, theses and videos related to the Miss Universe contest. The study indicated that the pattern of the Thai national costume on the stage of the Miss Universe contest. It can be divided into 3 forms Traditional Thai costumes, Apply Thai costumes and Creative Thai costumes under the concept “Creative Thai”. The change of the Thai national dress is the result of economic and social factors in each period. Including the formulation of national costume styles by the copyright holders, sending representatives to Miss Universe contest. As a result, the pattern of the Thai national Costumes has changed resulting in many awards from Miss Universe contest. It caused the follow-up trend of Thai National costumes and influencing the style of Thai national costumes on the national stage and international stage to the present.
