The ornamental design for a hat, as shown and described.
FIG. 1 is a front, right side, top perspective view of the hat showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a left side elevational view thereof;
FIG. 5 is a right side elevational view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof; and,
FIG. 8 is a perspective view thereof wherein the hat is disposed within an environment in which it is being used.
The broken line depiction of the partial human figure in FIG. 8 assists in illustrating how the claimed design may appear when worn and forms no part of the claimed design.