We claim the ornamental design for a pair of bib shorts, as shown and described.
FIG. 1 is a front view of a pair of bib shorts, showing our new design and according to the present invention;
FIG. 2 is a rear view of a pair of bib shorts, showing our new design and according to the present invention;
FIG. 3 is a left side view of a pair of bib shorts, showing our new design and according to the present invention; and,
FIG. 4 is a right side view of a pair of bib shorts, showing our new design and according to the present invention.
The bottom edge of the front leg of the bib shorts is a distinct color from the rest of the bib shorts. In the preferred embodiment, the bottom edge is amethyst, gold or silver.