The ornamental design for a headrestcover with pillow, as shown and described.
FIG. 1 is a perspective view of the headrest cover with pillow, showing the new design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a back elevation view thereof;
FIG. 4 is a right side elevation view thereof;
FIG. 5 is a left side elevation view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is bottom plan view thereof;
FIG. 8 is a sagittal cross-sectional view taken through 8-8 of FIG. 7, the dashed lines and fill indicating hidden features of the headrest cover and pillow forming no part of the claimed design; and,
FIG. 9 is a perspective view thereof, shown in a position of use on a headrest of a car seat in a vehicle interior.
The broken lines in the drawings are for illustrative purposes only and form no part of the claimed design.