The ornamental design for a three-leaf clover hat, as shown and described.
FIG. 1 is a perspective view of the three-leaf clover hat showing my new design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a bottom plan view thereof;
FIG. 4 is a front elevation view thereof;
FIG. 5 is a rear elevation view thereof;
FIG. 6 is a right side elevation view thereof; and,
FIG. 7 is a left side elevation view thereof.
The broken line pattern showing a hypothetical human head wearing the cap in FIG. 1 illustrates environmental matter and forms no part of the claimed design. The oval head opening shown in a short-long-short broken line pattern in FIG. 1 and FIG. 3 is an unclaimed feature.