The ornamental design for a headwear, as shown and described.
FIG. 1 is a front left side perspective view showing the nature and environmental use of a headwear;
FIG. 2 is a front right side perspective view of the headwear;
FIG. 3 is a front elevation view thereof;
FIG. 4 is a rear elevation view thereof;
FIG. 5 is a left side elevation view thereof;
FIG. 6 is a right side elevation view thereof; and,
FIG. 7 is a top plan view thereof.
The partial human figure shown in broken lines in FIG. 1 represents environmental structure that forms no part of the claimed design. The broken line illustrated in the interior of the headwear defines the bounds of the claim, and broken line and area within the broken line do not form part of the claimed design.