The ornamental design for an outdoorseatingarmrestcover, as shown and described.
FIG. 1 is a perspective environmental view of an outdoor seating armrest cover attached to an arm rest of an outdoor chaise lounge chair;
FIG. 2 is a perspective view showing the top, front, and right sides of the outdoor seating armrest cover in an unattached state having front and rear pairs of attachment ties hanging downward from the bottom of the cushioning padv;
FIG. 3 is a front view of the outdoor seating armrest cover showing the front and rear pair of attachment ties hanging downward from the bottom of the cushioning pad;
FIG. 4 is a rear view of the outdoor seating armrest cover showing the front and rear pair of attachment ties hanging downward from the bottom of the cushioning pad;
FIG. 5 is a right side view of the outdoor seating armrest cover showing the front and rear pair of attachment ties hanging downward from the bottom of the cushioning pad;
FIG. 6 is a left side view of the outdoor seating armrest cover showing the front and rear pair of attachment ties hanging downward from the bottom of the cushioning pad;
FIG. 7 is a top view of the outdoor seating armrest cover showing the front and rear pair of attachment ties hanging downward from the bottom of the cushioning pad; and,
FIG. 8 is a bottom view of the outdoor seating armrest cover showing the front and rear pair of attachment ties hanging downward from the bottom of the cushioning pad, and showing a non-slip pad bonded to the bottom of the cushioning pad.
The broken lines show environmental structure. The broken lines are unclaimed, and form no part of the claimed design.