The ornamental design for an article of clothing, as shown and described.
FIG. 1 is a perspective view of an article of clothing, showing my new design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a bottom plan view thereof;
FIG. 6 is a right-side elevation view thereof; and,
FIG. 7 is a left-side elevation view thereof.
The broken lines consisting of evenly spaced lines in the drawings depict parts of the article of clothing that form no part of the claimed design, while the broken lines consisting of dash-dot-dash lines in the drawings depict symbolic breaks in the length of the strap portion of the article of clothing, wherein the appearance of any portion of the article of clothing between the break lines forms not part of the claimed design.