The ornamental design for a hatbrim, as shown and described.
FIG. 1 is a front view of a hat brim according to the present invention.
FIG. 2 is a back view of the hat brim of FIG. 1.
FIG. 3 is a right side view of the hat brim of FIG. 1.
FIG. 4 is a left side view of the hat brim of FIG. 1.
FIG. 5 is a top view of the hat brim of FIG. 1; and,
FIG. 6 is a bottom side view of the hat brim of FIG. 1.
The dotted lines on the brim depict claimed stitching. The evenly spaced broken lines and areas illustrating the hat crown and ribbon features depict environmental subject matter that forms no part of the claimed design.