This study is on the sewing construction of the 17th century clothing through the Excavated Costumes in O-chang, ChungBuk in 1998. The followings are the results of this study. There are various sewing constructions in this excavates costume : a running stitch.a back stitch.a half back stitch.a french seam.a gobsol(korean traditional seam sewing). We can see that the sewing construction of the 17th century-clothing depends on construction styles : one layer, two layers, clothing padded with cotton(include quilt). We can see that sewing construction in the one taler clothing consisted of a running stitch, a french seam, a gobsol seam. In the two layer clothing the construction included a running stitch and half back stitch. a running switch and a decorated top stitch(3stitch) were used in the clothing padded with cotton. We can see that the sewing construction enhanced the function of keeping the shape of clothing and the raw edges. We can see that the shape of clothing is important in presentation of aesthetic of the clothing. Such a kind of sewing construction lasted from the early Chosen Dynasty through the 17th century.