The ornamental design for a scarf with zipper, as shown and described.
FIG. 1 is a plan view of front of a scarf with zipper with front of zipper and straps buttoned.
FIG. 2 is a plan view of the back thereof.
FIG. 3 is a plan view of the front of the scarf with zipper with the straps unbuttoned.
FIG. 4 is a plan view of the back thereof.
FIG. 5 is a front perspective view of the scarf with zipper shown in a condition of use; and,
FIG. 6 is a front perspective view of the scarf with zipper.
The partial human figure illustrated by broken lines represents environmental subject matter included to assist in showing how the claimed design may appear when worn and forms no part of the claimed design.