We claim the ornamental design for a bra, as shown and described.
FIG. 1 is a left, front perspective view of a bra, showing our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a right, front perspective view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof; and,
FIG. 6 is a bottom view thereof.
The broken lines illustrating portions of the bra represent features that form no part of the claimed design. The broken lines immediately adjacent to the shaded area represent boundaries of the claim and form no part of the claimed design.