The ornamental design for a scarf, as shown and described.
FIG. 1 is a top plan view showing our new design of a scarf laid out flat, the reverse side being a mirror image thereof;
FIG. 2 is a front elevation view of the scarf of FIG. 1 in a worn configuration;
FIG. 3 is a rear elevation view of the scarf of FIG. 1 in the worn configuration;
FIG. 4 is a top plan view of the scarf of FIG. 1 in the worn configuration;
FIG. 5 is an elevation view of a left side of the scarf of FIG. 1 in the worn configuration;
FIG. 6 is an elevation view of a right side of the scarf of FIG. 1 in the worn configuration; and,
FIG. 7 is a front perspective view of the scarf of FIG. 1 in the worn configuration.
Each of the white intermediate areas, the black lines, and the hatched intermediate areas shown in FIGS. 1 through 7 represent a contrast in appearance. The parallel dotted lines on the left and right ends of the scarf represent environmental structure that forms no part of the claimed design. The dashed lines depicting a person in FIGS. 1 through 7 assist in illustrating how the claimed design may appear when worn and form no part of the claimed design.