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 elevation view of the headwear;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a right side elevation view thereof;
FIG. 5 is a left side elevation view thereof; and,
FIG. 6 is a top plan view thereof.
The partial human figure shown in broken lines represents environmental structure that form no part of the claimed design. The broken lines within the bounds of the claim illustrate portions of the headwear that form no part of the claimed design.