The ornamental design for an upper bodygarment, as shown and described.
FIG. 1 is a front view of an upper body garment showing my new design;
FIG. 2 is a front right perspective view thereof;
FIG. 3 is a right side view thereof;
FIG. 4 is a left side view thereof; and,
FIG. 5 is a rear view thereof.
The broken lines immediately adjacent to the shaded area represent unclaimed boundaries of the design. The broken lines showing the remainder of the upper body garment represent unclaimed subject matter and form no part of the claimed design. The contrast in shading represents a contrast of appearance only and does not represent any particular color, texture, or material.