The ornamental design for a shirt with diagonalpocket, as shown and described.
FIG. 1 is a front perspective view of a shirt with diagonal pocket showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a left side elevational view thereof;
FIG. 5 is a right side elevational view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
In FIGS. 1-7, the broken lines showing portions of the human figure form no part of the claimed design. The remaining broken lines, on the surface of the shirt, represent stitching.