I claim the ornamental design for a seat cover, as shown and described.
FIG. 1 is a top-rear perspective view of a seat cover accessory unit showing my new design, in accordance with the present invention;
FIG. 2 is a top-front perspective view thereof;
FIG. 3 is a front plan view of a portion of the seat cover accessory unit of FIG. 1;
FIG. 4 is a rear plan view thereof;
FIG. 5 is another rear plan view of a portion of the seat cover accessory unit of FIG. 1;
FIG. 6 is a left side plan view thereof, the right side being a mirror image thereof; and,
FIG. 7 is a top plan view thereof.
The furniture shown in broken lines in FIGS. 1-7 is shown for environmental use purposes only, and forms no part of the claimed design. The “logo” designation in FIGS. 1-4, shown in broken lines depicts parts of the seat cover that form no part of the claimed design. FIG. 3 shows the seat cover accessory unit with the tray table and tray table cover removed for ease of illustration, and FIG. 5 shows the tray table and tray table cover with the seat cover, arm rest covers, and underlying seat removed for ease of illustration.