The ornamental design for an undergarment, as shown and described.
FIG. 1 is a front perspective view of an undergarment showing our new design in an in-use configuration;
FIG. 2 is a front view thereof;
FIG. 3 is a rear top perspective view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof;
FIG. 8 is a front view of the undergarment of FIGS. 1-7 in a flat configuration; and,
FIG. 9 is a front view of the undergarment of FIGS. 1-7 in an inside-out, flat configuration.
The broken lines depicting the remainder of the undergarment form no part of the claimed design; and, the broken lines immediately adjacent to the shaded area depict boundaries of the claimed design and form no part thereof. Moreover, any unshaded region within a shaded area that is demarcated by broken lines forms no part of the claimed design. In addition, the first density and second density of shading of the undergarment depicts different appearances of the undergarment.