The ornamental design for a lower bodygarment, as shown and described.
FIG. 1 is a perspective view of a lower body garment of the present design;
FIG. 2 is a front view thereof;
FIG. 3 is a back view thereof;
FIG. 4 is a right side view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a top view thereof; and,
FIG. 7 is a bottom view thereof.
The broken line portions of the lower body garment are for illustrative purposes only, showing environmental structure, and form no part of the claimed design. The lower body garment is shown with a symbolic break in length, indicating variable length.