The ornamental design for a necktie, as shown and described.
FIG. 1 is a perspective view of the necktie according to my new invention.
FIG. 2 is a first side view of the necktie of FIG. 1.
FIG. 3 is a top view of the necktie of FIG. 1.
FIG. 4 is a second side view of the necktie of FIG. 1.
FIG. 5 is a first end view of the necktie of FIG. 1.
FIG. 6 is a second end view of the necktie of FIG. 1.
FIG. 7 is a back view of the necktie of FIG. 1; and,
FIG. 8 is an enlarged front view of the necktie of FIG. 1 in a tied configuration.
The broken lines in FIG. 8 showing portions of a person's neck, a dress shirt and a suit coat illustrate environmental matter that forms no part of the claimed design.