The ornamental design for a leotard with convertiblebib, as shown and described.
FIG. 1 is a front view of a first embodiment of a leotard with convertible bib with the bib attached;
FIG. 2 is another front view thereof with the bib removed;
FIG. 3 is a rear view thereof;
FIG. 4 is a rear view of a second embodiment of a leotard with convertible bib, the front with and without the bib and the side perspective views being identical with the exception of the broken line rear neckline edge; and,
FIG. 5 is a side perspective view thereof with the bib attached.
The evenly spaced broken lines shown in the FIG. 4 view represent an unclaimed boundary that forms no part of the claimed design. The dot-dash broken lines shown in the FIG. 5 view are directed to environment that forms no part of the claimed design.