The ornamental design for a scarf, as shown and described.
FIG. 1, is a right side view of the scarf. The left side is a mirror image.
FIG. 2 is a front view of the scarf shown in FIG. 1.
FIG. 3 is a rear view of the scarf shown in FIGS. 1 and 2.
FIG. 4 is a rear view of the scarf before it is tied around a wearer's head.
FIG. 5 is a side view of the scarf shown in FIGS. 1-4 in an untied condition; and,
FIG. 6 is a front view of the scarf shown in FIGS. 1-5 in an untied condition.
The broken lines showing a person's head and neck in the drawings are meant to depict the design while in a condition of use, and form no part of the claim. The broken lines at the base of the crown in FIG. 4 are stitching and form no part of the claimed design.