I claim the ornamental design for an undergarment with a rear pocket, as shown and described.
FIG. 1 is a top perspective view of an undergarment with a rear pocket, showing my new design with a pocket in a closed position;
FIG. 2 is a front elevational view of FIG. 1;
FIG. 3 is a rear elevational view of FIG. 1;
FIG. 4 is a left-side elevational view of FIG. 1, the right-side elevational view being a mirror image thereof;
FIG. 5 is a top plan view of FIG. 1;
FIG. 6 is a bottom plan view of FIG. 1;
FIG. 7 is a bottom perspective view of FIG. 1; and,
FIG. 8 is a bottom perspective view thereof, illustrated with the pocket in an open position.
The broken lines showing a lace border and an inside patch in FIG. 1, and a condom package in FIG. 8, depict environmental matter and form no part of the claimed design. The broken lines in FIGS. 3, 5 and 7 represent stitching.