The ornamental design for a pocket for clothing, as shown and described.
FIG. 1 is a perspective view of pocket for clothing showing my new stitching design with tab, e.g., tag or label.
The broken lines shown in FIG. 1 are included for the purposes of illustrating environment and form no part of the claimed design. The solid lines in FIG. 1 show the stitching of my design and the shading shows the surface of the tab or label of my design.