I claim the ornamental design for a hat, as shown and described.
FIG. 1 is a bottom perspective view of a hat showing my design;
FIG. 2 is a top perspective view thereof;
FIG. 3 is a front elevation view thereof;
FIG. 4 is a left side elevation view thereof;
FIG. 5 is a bottom elevation view thereof;
FIG. 6 is a right side elevation view thereof;
FIG. 7 is a top plan view thereof; and,
FIG. 8 is a rear elevation view thereof.
The broken lines illustrating head hole defined in the bottom surface, the handle on the front side, and surface ornamentation on the hat are for illustrative purposes only, and form no part of the claimed design.