The ornamental design for the nursing garment, as shown and described.
FIG. 1 is a front view of a nursing garment in use, embodying our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a top view thereof;
FIG. 4 is a bottom view thereof;
FIG. 5 left side elevational view thereof;
FIG. 6 right side elevational view thereof; and,
FIG. 7 is an additional front view thereof.
The dot-dash broken lines show the bounds of the claim and form no part of the claimed design. The even broken lines shown in the drawings illustrate portions of the nursing garment and form no part of the claimed design.