the movement of the carrier 107 then the clamper 201 opens outwards beyond the straight state in order to expose the sliced fringes outside the stocking material the gore piece feeding assembly 401 and the gore piece fitting assembly 501 in accordance with the present invention are both arranged facing the third station iii a diamond shaped gore piece 30 is fed towards the sliced fringes exposed outside the stocking material by the feeding assembly 401 at this timing the fitting assembly 501 puts the gore piece 30 in a folded state and fits same to the inside thigh opening defined by the sliced fringes concurrently the lower fringe of the folded gore piece 30 and the lower side sliced fringes are bent to be held to the lower surface of the clamper 201 during travel from the third to fourth station the clamper 201 in this embodiment is turned over 180 degrees in order to turn the sliced fringes of the stocking material it holds inside out so that seam lines on the stocking material and the gore piece are placed closer to the sewing machines during travel from the fourth to fifth station the upper sliced fringe of the stocking material and the upper side fringe of the folded gore piece are seamed together by the first sewing machine 601 a bending assembly 701 is arranged at the fifth station v in order to bend upwards the seamed upper sliced fringe and the upper side fringe of the gore piece next.