The ornamental design for a hat, as shown and described.
FIG. 1 is a perspective view of a hat, showing my new design;
FIG. 2 is a right elevation view of FIG. 1;
FIG. 3 is a left elevation view of FIG. 1;
FIG. 4 is a top plan view of FIG. 1;
FIG. 5 is a bottom plan view of FIG. 1;
FIG. 6 is a rear elevation view of FIG. 1; and,
FIG. 7 is a front elevation view of FIG. 1.
The evenly-sized broken lines consisting of dash-dash lines depict portions of the hat that form no part of the claimed design. The unevenly-sized broken lines consisting of dash-dot-dash lines defines the bounds of the claim and does not form part of the claimed design.