The purpose of this study is to compare Jegory with Simii, and to understand the construction of Jegory, assuming that Jegory is related to Simii system. The results obtained are as follows; 1. Tgie-ku-li was the first record among the name of Jegory in literature, was called about A.D. 1408. 2. When Jegory and Simii were cut, front-back width and sleeve length standarded on the width of cloth. 3. The cutting of Jegory disposed to seperate right and left width, to connect front and back width up to the middle term of Chosen Dynasty Period. 4. The sewing order of the Simii was Dungsol-Jindong-Baerae-Sougu The sewing order of the Jegory in 「The Book of Chosen sewing」 was Shoulder-Jindong-Baerae-Sup-Dungsol-Kit and in literature of 1960`s it was similar to Simii. 5. The lined clothes in 「The Book of Chosen Sewing」 was sewn to put the inside in the surface, different from the literature of 1960`s. 6. In Chosen Dynasty Period the shape of Simii depended on 「Moon Kong Ka Rye」, but it was changed to similar to Jegory in the latter term. 7. The empty void in Jegory offers usefulness. It relates to Oriental negativism that yin is more useful than yang.