The ornamental design for a woman's undergarment, as shown and described.
FIG. 1 is a front perspective view of a woman's undergarment showing my new design;
FIG. 2 is a rear perspective view thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a bottom plan view thereof;
FIG. 5 is a front elevation view thereof;
FIG. 6 is a ride side view, the left side being a mirror image thereof;
FIG. 7 is a rear elevation view thereof.
The broken line showing of the human figure in FIGS. 1, 2, and 5–7 is for illustrative purposes only and forms no part of the claimed design. The tight broken line showing on the undergarment in FIGS. 1–7 represents stitching.