The ornamental design for 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 cross-hatching on the front of the briefs portions of the bib shorts (shown in FIGS. 1, 3, and 4) represents a woven mesh, and is not indicative of color. The bottom edge of one cuff of one of the legs of the bib shorts appearing as a heavier line is a distinct and contrasting color from the rest of the cuff and the legs of the bib shorts.