The purpose of this study is to investigate the characteristics of costume and its ornaments which are appeared in the traditional wedding ceremonial customs and the wedding costumes of Eastern Slav, that is consisted of Russian, Belarusian and Ukrainian from the 19 to the early of 20C. In this study, many different procedures of wedding ceremony with a various kind of wedding costumes are shown. A wedding custom of Eastern Slav had been developed by a intermixed style of the Christianism and a paganism. The wedding custom is organized by the 3 sequential procedures; before a wedding, a wedding, after a wedding Their wedding means the union of the bride into the bridegrooms family in order to establish a new family. Therefore, the wedding costumes have been developed according to this, and the head gears have developed as a symbol which presents the meaning. A brides costume is composed of a head gear, "Lubaha", and "Sarafan" or a skirt. A bridegrooms one is made up of "Lubaha", and trousers. These costumes are kept through their whole life, and are worn in every important ceremonial period. Even though, the wedding customs and the wedding costumes of Russia, Belarus, and Ukrain have been developed by their general commonness, there are regionally certain differences. It is one of the important research object of the Eurasian era in the view point of culture and ethnographic, that to know the symbolism appeared in the traditional weeding ceremonial customs and the wedding costumes of Eastern Slav.ding costumes of Eastern Slav.