The ornamental design of a hat, as shown and described.
FIG. 1 is a top, right perspective view of a hat;
FIG. 2 is a top right perspective view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a back view thereof;
FIG. 6 is a right, side view thereof;
FIG. 7 is a top view thereof; and,
FIG. 8 is a top view thereof.
The broken-line outline of the partial human figure assists in illustrating how the claimed design of the hat may appear when worn but forms no part of the claimed design.