The ornamental design for a one piecebabygarment with zipper cover, as shown and described.
FIG. 1 is a bottom perspective view of the one piece baby garment with zipper cover in accordance with my new design.
FIG. 2 is a front plan view thereof;
FIG. 3 is a back plan view thereof;
FIG. 4 is a left side elevation view thereof;
FIG. 5 is a right side elevation view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof; and,
FIG. 8 is a bottom perspective view thereof.
The broken lines shown in the drawings are for the purpose of illustrating portions of the one piece baby garment with zipper cover that form no part of the claim.