Currently, the thailand has many ethnic groups immigrants. Whether it is ethnic Karen, Hmong, Phu Tai. The tribes, which I will mention a tribe. Refugees from Myanmar A tribe that has a distinctive the women's apparel. This tribe would have the brass rings to wear a collar.Which is considered a symbol of this tribe that has it. This tribe was "Karens". I believe that many people would know. May be known through the media or had ever heard. Highlights of this tribe is. The brass loop at the neck. They made a long neck than usual. Why do they wear loop of brass in the neck. This question is a question many people want answered.