The ornamental design for a maternityundergarment, as shown and described.
FIG. 1 is a perspective view of a maternity undergarment showing my new design;
FIG. 2 is a front side elevational view thereof;
FIG. 3 is a back side elevational view thereof;
FIG. 4 is a left elevational view thereof;
FIG. 5 is a right elevational view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof; and,
FIG. 8 is a perspective view thereof in an environment of use.
The closely spaced dashed broken lines in FIG. 8 show background environment that forms no part of the claimed design. The dotted broken line portion of the figure drawings is included to show portions of the article that form no part of the claimed design. The widely spaced dash broken line portion of the figure drawings is included to show portions of the article that form no part of the claimed design. The double closely spaced smaller dashed broken lines following the contour of the article are included to show portions of the article that form no part of the claimed design.
The raised rectangular features shown in the corners of the article are hook and loop fasteners.