The ornamental design for a bib, as shown and described.
FIG. 1 is a front elevational view of a bib, showing my new design;
FIG. 2 is a rear elevational view thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a bottom plan view thereof;
FIG. 5 is a left side elevational view thereof;
FIG. 6 is a right side elevational view thereof; and,
FIG. 7 is an enlarged front perspective view thereof, shown in use.
The broken lines in FIGS. 1, 2 and 7 inside the periphery of the bib, and the broken lines in FIGS. 1, 2 and 7 in the shape of a collar, are for illustrative purposes only and form no part of the claimed subject matter. The broken lines in FIG. 7 that depict the shape of a person represent environment and form no part of the claimed subject matter.