The ornamental design for a chaircover, as shown and described.
FIG. 1 is a perspective view of a chair cover showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a back elevational view thereof;
FIG. 4 is a left side elevational view thereof;
FIG. 5 is a right side 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 shown in a position of use with an environmental chair.
The broken lines comprising same-sized dashes in the drawings are for the purpose of illustrating environment only and form no part of the claimed design.
The broken lines comprising alternating long and short dashes in the drawings define the boundary of the claim.