The ornamental design for a pair of stockings, as shown and described.
FIG. 1 is a perspective view of a stocking for a left foot showing my new design for a pair of stockings;
FIG. 2 is a left side view of the stocking shown in FIG. 1;
FIG. 3 is a rear view of the stocking shown in FIG. 1;
FIG. 4 is a right side view of the stocking shown in FIG. 1; and,
FIG. 5 is a bottom view of the stocking shown in FIG. 1.
FIGS. 1-5 show a stocking for a left foot, depictions of the stocking for the right foot having been omitted as they are mirror images of the stocking for the left foot.