I claim the ornamental design for a necktie, as shown and described.
FIG. 1 is a front perspective view of my necktie;
FIG. 2 is a rear perspective view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a right side view thereof;
FIG. 5 is a rear view thereof;
FIG. 6 is a front view of an alternative version of my necktie of FIG. 1; and,
FIG. 7 is a right side view thereof.
The broken lines along the pocket and loop of the necktie illustrate stitching that forms no part of the claimed design. All other broken lines portray portions of the necktie that form no part of the claimed design.