The ornamental design for a bib, substantially as shown and described.
FIG. 1 is a front elevational view of a bib showing my new design, the neck
strap thereof shown in the closed position; the back of the bib being of
substantially the same configuration as the front, but without the
decorative motif; and
FIG. 2 is a sectional view taken along line 2--2 of FIG. 1.