The ornamental design for an automotive seatcover having an integral umbrella holder, as shown and described.
FIG. 1 is a perspective view of a drivers side car seat showing an automotive seat cover having integral umbrella holder;
FIG. 2 is a close-up cut away perspective view thereof; and,
FIG. 3 is a perspective view of a passenger side car seat thereof.
The broken line showing of an umbrella, and seat fixtures are included for the purpose of illustrating structural environment and forms no part of the claimed design.