The ornamental design for a “shirt”, as shown and described.
FIG. 1 is a front view of a shirt showing my new design;
FIG. 2 is a rear view thereof;
FIG. 3 is a right side view thereof;
FIG. 4 is a right side view thereof; and
FIG. 5 shows the shirt in an alternate buttoned configuration;
FIG. 6 is an enlarged fragmentary view of the encircled area identified as 6 in FIG. 1 showing one side of the collar in an alternate raised configuration; and,
FIG. 7 is an enlarged fragmentary view of encircled area identified as 7 in FIG. 3 showing the cuff in an alternate unbuttoned configuration;