A needle assembly for a stitching machine, the needle assembly comprising: a stitching jig comprising: a needle holder having a plurality of needle sockets configured to hold a plurality of needles; a needle clamp hoop connected to the needle holder to retain needles in the plurality of needle sockets; and a fixing jig connected to the needle clamp hoop and configured to couple with a reciprocating bar of the stitching machine; wherein the fixing jig includes a bar socket configured to receive the reciprocating bar, the bar socket disposed parallel to each of the plurality of needle sockets; a presser foot, the presser foot comprising: a lifter configured to couple with a presser bar of the stitching machine; and a presser foot plate having a plurality of holes, the plurality of holes being configured as through-bores configured to align with the plurality of sockets; wherein the fixing jig includes a base and a neck, the base having a surface configured to cover a matrix of holes in the presser foot and bores in the needle holder, and a hook cover plate including a plurality of holes configured to align with the plurality of needle sockets, characterized in that the hook cover plate includes a greater number of holes than the presser foot plate. a stitching jig comprising: a needle holder having a plurality of needle sockets configured to hold a plurality of needles; a needle clamp hoop connected to the needle holder to retain needles in the plurality of needle sockets; and a fixing jig connected to the needle clamp hoop and configured to couple with a reciprocating bar of the stitching machine; wherein the fixing jig includes a bar socket configured to receive the reciprocating bar, the bar socket disposed parallel to each of the plurality of needle sockets; a needle holder having a plurality of needle sockets configured to hold a plurality of needles; a needle clamp hoop connected to the needle holder to retain needles in the plurality of needle sockets; and a fixing jig connected to the needle clamp hoop and configured to couple with a reciprocating bar of the stitching machine; wherein the fixing jig includes a bar socket configured to receive the reciprocating bar, the bar socket disposed parallel to each of the plurality of needle sockets; a presser foot, the presser foot comprising: a lifter configured to couple with a presser bar of the stitching machine; and a presser foot plate having a plurality of holes, the plurality of holes being configured as through-bores configured to align with the plurality of sockets; wherein the fixing jig includes a base and a neck, the base having a surface configured to cover a matrix of holes in the presser foot and bores in the needle holder, and a hook cover plate including a plurality of holes configured to align with the plurality of needle sockets, characterized in that the hook cover plate includes a greater number of holes than the presser foot plate. a lifter configured to couple with a presser bar of the stitching machine; and a presser foot plate having a plurality of holes, the plurality of holes being configured as through-bores configured to align with the plurality of sockets; wherein the fixing jig includes a base and a neck, the base having a surface configured to cover a matrix of holes in the presser foot and bores in the needle holder, and a hook cover plate including a plurality of holes configured to align with the plurality of needle sockets, characterized in that the hook cover plate includes a greater number of holes than the presser foot plate.