The ornamental design for an article of clothing, as shown and described.
FIG. 1 is an enlarged perspective view of an article of clothing showing the claimed design.
FIG. 2 is front view thereof; and,
FIG. 3 is another front view thereof.
The broken lines, immediately adjacent to the full lines and shaded areas, in FIGS. 1–3, represent the boundary of the design and form no part of the claim.