The ornamental design for a furniture with stitching, as shown and described.
FIG. 1 is a perspective view of a furniture stitching;
FIG. 2 is an enlarged view of the furniture stitching of FIG. 1;
FIG. 3 is a front elevation view thereof; and,
FIG. 4 is an enlarged view of the furniture stitching of FIG. 3.
Broken line immediately adjacent to solid lines illustrate claimed stitching. All other broken lines illustrate portions of the furniture with stitching that form no part of the claimed design.