The ornamental design for a cover for a purse, as shown and described.
FIG. 1 is a perspective view of the cover on the front of a purse
FIG. 2 is a perspective view of the cover on the front with flap down; and,
FIG. 3 is a perspective view of the cover on the back of a purse.
Expandable purse covers are made to fit over an existing purse, without any change to the purse itself. The covers have expandable material, which accommodates various size purses. It has detachable straps that can be used as needed to change the look of the purse. There is a secured top opening, which allows easy access to the contents of the purse. Users do not have to purchase an additional purse in order to change the look with different covers. They will also not have to worry about a removable inner lining not fitting properly into their existing purse. This provides a quick, convenient, fashionable look.