The ornamental design for an article of clothing, as shown and described.
FIG. 1 is an enlarged front perspective view of an article of clothing showing our new design;
FIG. 2 is a front elevation view of the invention in FIG. 1;
FIG. 3 is a left side elevation view of the invention in FIG. 1;
FIG. 4 is a top plan view of the invention in FIG. 1;
FIG. 5 is a rear elevation view of the invention in FIG. 1;
FIG. 6 is a right side elevation view of the invention in FIG. 1; and,
FIG. 7 is a bottom view of the invention in FIG. 1.
The uniformly spaced broken lines and the dot-dot dashed broken lines illustrate portions of the article of clothing which forms no part of the claimed design.